Bump org.bouncycastle:bcprov-jdk15on from 1.64 to 1.70

Bumps [org.bouncycastle:bcprov-jdk15on](https://github.com/bcgit/bc-java) from 1.64 to 1.70.
- [Changelog](https://github.com/bcgit/bc-java/blob/main/docs/releasenotes.html)
- [Commits](https://github.com/bcgit/bc-java/commits)

---
updated-dependencies:
- dependency-name: org.bouncycastle:bcprov-jdk15on
  dependency-version: '1.70'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle

@@ -130,7 +130,7 @@ dependencies {
     api 'com.auth0:java-jwt:3.19.4'
     api 'com.auth0:jwks-rsa:0.23.0'
 
-    testImplementation 'org.bouncycastle:bcprov-jdk15on:1.64'
+    testImplementation 'org.bouncycastle:bcprov-jdk15on:1.70'
     testImplementation 'org.hamcrest:java-hamcrest:2.0.0.0'
     testImplementation 'org.hamcrest:hamcrest-core:1.3'
     testImplementation 'org.mockito:mockito-core:2.8.9'