[6.3.0] Make cpp file extensions case sensitive again#18552

iancha1992 merged 2 commits intobazelbuild:release-6.3.0bazelbuild/bazel:release-6.3.0from

FaBrand:release-6.3.0-cherrypick-e4990f8a20e44f7a7875f614e9fc2fe24b051fd9FaBrand/bazel:release-6.3.0-cherrypick-e4990f8a20e44f7a7875f614e9fc2fe24b051fd9Copy head branch name to clipboard