Add support for `+` in canonical repo names

[fmeum]

Also add a missing Bzlmod dependency that otherwise fails the example with --noenable_workspace.

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Changes are visible to end-users: yes/no

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: yes

Test plan

• Manual testing; please provide instructions so we can reproduce:

  bazel build //examples/... --incompatible_use_plus_in_repo_names

[fmeum]

@alexeagle Merging and releasing this should get you Bazel 8 compatibility.

[aspect-workflows[bot]]

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Buildifier      Format

[alexeagle]

will be released in v2.0.2