[CI] PR labeler (triage) fails after actions/labeler v7 bump: deficient indentation in labeler.yml

[weiqingy]

Describe the bug

The Pull Request Labeler workflow (the triage check) fails on PRs whose run happens after #2410 was merged, with:

##[error]YAMLException: deficient indentation (27:7)

while parsing .github/labeler.yml. This blocks the triage check on affected PRs (for example #2409).

Root cause

#2410 bumped actions/labeler from v6 to v7. labeler v7 depends on js-yaml ^5.1.0, which is stricter about indentation of multi-line flow sequences than the version v6 used. The current .github/labeler.yml writes each label's globs as a multi-line flow sequence:

infra:
  - changed-files:
    - any-glob-to-any-file: [
        ".github/**",
        ".gitmodules"
      ]

js-yaml 5.x rejects the closing-bracket indentation here. This is reproducible locally: js-yaml 5.2.1 (the version labeler v7 resolves) throws the exact deficient indentation (27:7) on the current file, while js-yaml 4.3.0 parses it without complaint.

To Reproduce

1. Open or re-run any PR after Bump actions/labeler from 6 to 7 #2410 merged.
2. The Pull Request Labeler / triage check fails in a few seconds.

Expected behavior

The triage check passes and labels are applied.

Additional context

Fix: write the glob lists as block sequences (the style actions/labeler documents for v5+), which parses cleanly under js-yaml 5.x. This is the same class of change as #1842, which adapted the config for the v4 to v6 bump.