ML Metadata 1.21.0

Major Features and Improvements

• Added Python 3.12 and Python 3.13 support.

Breaking Changes

• Removed Python 3.9 support.
• Removed ZetaSQL-based filter_query functionality. The filter_query
  parameter in ListOptions that relied on ZetaSQL for declarative filtering
  has been removed in version 1.21.0. Users should migrate to native lookup
  and lineage APIs (such as get_artifacts_by_uri, get_artifacts_by_context,
  and get_lineage_subgraph) and filter retrieved objects directly in Python.

Deprecations

• N/A

Bug Fixed and Other Changes

• Upgraded Bazel minimum required version to 7.7.0.
• Upgraded Protobuf C++ and Python dependencies to v31.1 / 6.31.1 to align with TensorFlow 2.21.
• Upgraded Abseil (com_google_absl) C++ libraries to stable LTS release 20250127.
• Upgraded gRPC (com_github_grpc_grpc) to stable release v1.70.1.
• Upgraded boringssl dependency to stable commit 16c8d3db1af20fcc04b5190b25242aadcb1fbb30 to support OpenSSL 1.1.0+ APIs in modern gRPC versions.
• Upgraded rules archives (rules_swift, rules_go, bazel_gazelle, platforms) to Bazel 7 compatible versions.