Release 1.75.0 missing from Bazel registry

The [publish-to-bcr-bot](https://github.com/apps/publish-to-bcr-bot) appears not to have submitted the 1.75.0 release to BCR:

https://github.com/bazelbuild/bazel-central-registry/pulls?q=is%3Apr+grpc
https://registry.bazel.build/modules/grpc


