chore: upgrade to Bazel 7

[alexeagle]

No description provided.

[alexeagle]

Current build failure due to bazelbuild/bazel@a76763c

Fixed by https://github.com/bazelbuild/rules_apple/releases/tag/3.0.0-rc2

Replaced apple_common.multi_arch_split with new transition, this should not be a breaking change but is required for bazel 7.x support. Please file any issues you find!

[pcj]

Looks like com_github_grpc_grpc isn't happy yet.

[alexeagle]

@pcj do you have more pointers about what's broken with it?

[pcj]

@alexeagle Just looking at the logs from https://github.com/stackb/rules_proto/actions. Maybe it just needed more recent rules_apple as you recently committed. CI has new error though.

[pcj]

Also was looking at grpc/grpc#35391. Hopefully will work. There should be tests here for virtual imports.

[alexeagle]

grpc/grpc@45aecbe is the beginning of "Bazel 7 to the support bazel versions" so trying to upgrade to oldest release containing that.

[pcj]

Seems like the apple version isn't quite right?

Error: file '@build_bazel_apple_support//configs:platforms.bzl' does not contain symbol 'CPU_TO_DEFAULT_PLATFORM_NAME'

[alexeagle]

Sorry, I hope to come back to this but I'm not sure when I'll get time. If the client we're working for is able to upgrade to Bazel 7 without changes here, then I'll have less reason to prioritize it.

[alexeagle]

Our client finished their Bazel 7 upgrade, so this isn't critical for users. Just a housekeeping change for development in the repo.
I'm not planning to work on it more.