Add support for using Maven BOMs with Coursier

[protocol7]

Coursier now support using Maven BOMs when resolving. This upgrades Coursier to 2.1.23 and enables using BOMs leveraging the existing boms attribute on maven_install.

Note that Coursier has a slight performance regression since adding support for BOMs, see coursier/coursier#3190.

Fixes #1289

[protocol7]

Had to disable dependencies from https://packages.confluent.io as the repository seems to be broken at the moment.

Not sure about the remaining CI failure, as it looks to be unrelated to this change:

2025-01-04 15:34:59 UTC	WARNING: Couldn't auto load rules or symbols, because no dependency on module/repository 'rules_android' found. This will result in a failure if there's a reference to those rules or symbols.
2025-01-04 15:35:00 UTC	ERROR: Traceback (most recent call last):
2025-01-04 15:35:00 UTC		File "/var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/ec321eb2cc2d0f8f91b676b6d4c66c29/external/+maven+regression_testing_coursier/BUILD", line 48, column 11, in <toplevel>
2025-01-04 15:35:00 UTC			aar_import(
2025-01-04 15:35:00 UTC	Error in aar_import: Couldn't auto load 'aar_import' from '@rules_android//rules:rules.bzl'.

[vinnybod]

@protocol7 What seems to be the issue with the packages.confluent.io repository? Was it intermittent?