Build Cache for Bazel v1.3.0

Changelog
1

What’s Changed

  • Bumps the pinned Bitrise Build Cache CLI from v0.17.7 to v3.4.4, which brings the Bazel credential-helper fix: the proxy lock is now the authority instead of the advertised pid, so concurrent helper processes no longer lose the login (ACI-5269)
  • The pin had not moved since July 2025, so this also picks up every CLI fix released in between
  • e2e no longer builds CPython from source (it segfaulted on macOS 26), using the Python the stack already provides instead