Android/JVM deps throw `GET returned 429 Too Many Requests`

[KVSRoyal]

Describe the bug

Android builds sometimes fail locally and in CI/CD with a GET returned 429 Too Many Requests error when Bazel attempts to download a dependency from android.googlesource.com.

To Reproduce

Run the Android CI pipeline on CircleCI. The build fails during Bazel's dependency fetch step with the following error:

ERROR: /home/circleci/.cache/bazel/_bazel_circleci/e8362d362e14c7d23506d1dfa3aea8b8/external/rules_android+/src/tools/java/com/google/devtools/build/android/dexer/BUILD:15:12: @@rules_android+//src/tools/java/com/google/devtools/build/android/dexer:DexFileSplitter depends on @@rules_android++com_android_dex_extension+com_android_dex//:dex in repository @@rules_android++com_android_dex_extension+com_android_dex which failed to fetch. no such package '@@rules_android++com_android_dex_extension+com_android_dex//': java.io.IOException: Error downloading [https://android.googlesource.com/platform/dalvik/+archive/5a81c499a569731e2395f7c8d13c0e0d4e17a2b6.tar.gz] to /home/circleci/.cache/bazel/_bazel_circleci/.../5a81c499a569731e2395f7c8d13c0e0d4e17a2b6.tar.gz: GET returned 429 Too Many Requests

Expected behavior

The Bazel dependency fetch should succeed and not crash android builds.

Screenshots

Not really screenshots, but build links:

• CircleCI failure (original)
• CircleCI failure (next day, still occurring)

Environment:

• OS: [e.g. iOS] er, any? Both CI/CD and my local MacOS 26
• Browser [e.g. chrome, safari]: N/A

Additional context

• The rules_android team has already merged a fix to use a mirror, but it hasn't been released yet.
• A patch was applied to unblock in this PR. It should be removed once we can upgrade to use the rules_android fix