[playground] Downgrade Next.js to a secure version (facebook#35317)

Was bumped to a canary in facebook#34499
which got never released as stable.

Presumeably to use `Activity` which only made it into Activity in later
Next.js releases. However, `Activity` never ended up being used due to
incompatibilities with Monaco Editor. Downgrading should be safe.

Downgrading to fix
GHSA-9qr9-h5gf-34mp.
This will allow new deploys since Vercel is currently blocking new
deploys of unsafe version

---------

Co-authored-by: Eugene Choi <[email protected]>

DiffTrain build for [55480b4](facebook@55480b4)

Author: pull[bot]

compiled/eslint-plugin-react-hooks/index.js

@@ -56356,8 +56356,6 @@ const COMPILER_OPTIONS = {
         validateNoCapitalizedCalls: [],
         validateHooksUsage: true,
         validateNoDerivedComputationsInEffects: true,
-        enableUseKeyedState: true,
-        enableVerboseNoSetStateInEffect: true,
     },
 };
 const FLOW_SUPPRESSION_REGEX = /\$FlowFixMe\[([^\]]*)\]/g;

compiled/facebook-www/REVISION

@@ -1 +1 @@
-5a970933c0aa5c5cfb9793cce49f3a282b191716
+55480b4d228986e502f4651f8e53a6f264a1858e

compiled/facebook-www/REVISION_TRANSFORMS

@@ -1 +1 @@
-5a970933c0aa5c5cfb9793cce49f3a282b191716
+55480b4d228986e502f4651f8e53a6f264a1858e

compiled/facebook-www/React-dev.classic.js

@@ -1499,7 +1499,7 @@ __DEV__ &&
     exports.useTransition = function () {
       return resolveDispatcher().useTransition();
     };
-    exports.version = "19.3.0-www-classic-5a970933-20251210";
+    exports.version = "19.3.0-www-classic-55480b4d-20251208";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled/facebook-www/React-dev.modern.js

@@ -1499,7 +1499,7 @@ __DEV__ &&
     exports.useTransition = function () {
       return resolveDispatcher().useTransition();
     };
-    exports.version = "19.3.0-www-modern-5a970933-20251210";
+    exports.version = "19.3.0-www-modern-55480b4d-20251208";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled/facebook-www/React-prod.classic.js

@@ -606,4 +606,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.3.0-www-classic-5a970933-20251210";
+exports.version = "19.3.0-www-classic-55480b4d-20251208";

compiled/facebook-www/React-prod.modern.js

@@ -606,4 +606,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.3.0-www-modern-5a970933-20251210";
+exports.version = "19.3.0-www-modern-55480b4d-20251208";

compiled/facebook-www/React-profiling.classic.js

@@ -610,7 +610,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.3.0-www-classic-5a970933-20251210";
+exports.version = "19.3.0-www-classic-55480b4d-20251208";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled/facebook-www/React-profiling.modern.js

@@ -610,7 +610,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.3.0-www-modern-5a970933-20251210";
+exports.version = "19.3.0-www-modern-55480b4d-20251208";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled/facebook-www/ReactART-dev.classic.js

@@ -20468,10 +20468,10 @@ __DEV__ &&
     (function () {
       var internals = {
         bundleType: 1,
-        version: "19.3.0-www-classic-5a970933-20251210",
+        version: "19.3.0-www-classic-55480b4d-20251208",
         rendererPackageName: "react-art",
         currentDispatcherRef: ReactSharedInternals,
-        reconcilerVersion: "19.3.0-www-classic-5a970933-20251210"
+        reconcilerVersion: "19.3.0-www-classic-55480b4d-20251208"
       };
       internals.overrideHookState = overrideHookState;
       internals.overrideHookStateDeletePath = overrideHookStateDeletePath;
@@ -20506,7 +20506,7 @@ __DEV__ &&
     exports.Shape = Shape;
     exports.Surface = Surface;
     exports.Text = Text;
-    exports.version = "19.3.0-www-classic-5a970933-20251210";
+    exports.version = "19.3.0-www-classic-55480b4d-20251208";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&