ci: bump actions/github-script from v8 to v9

The only use we have of `actions/github-script` is the "skip if the
commit or tree was already tested" step in `main.yml`, which checks
whether an identical tree-SHA was already built successfully. It
currently pins v8; v9 is the latest release.

What v9 changes:

- The `ACTIONS_ORCHESTRATION_ID` environment variable is now
  appended to the HTTP user-agent string. This is transparent to
  our script.
- A new injected `getOctokit` factory lets scripts create
  additional authenticated clients in the same step without
  importing `@actions/github`. We do not use it.
- Two breaking changes affect scripts that either call
  `require('@actions/github')` (fails at runtime, because
  `@actions/github` v9 is now ESM-only) or that shadow the
  implicit `getOctokit` parameter via `const`/`let` (syntax
  error). Our script does neither -- it only uses the pre-supplied
  `github` REST client and `core` helpers -- so the upgrade is
  safe.

Risk analysis: the step is advisory. It sets `enabled=' but skip'`
as an optimization to avoid re-running CI on a tree that was already
tested successfully. Even if the v9 upgrade broke the script, the
surrounding `try { ... } catch (e) { core.warning(e); }` block would
degrade it to a warning and CI would still run normally. In practice
the script continues to work identically on v9.

See also:

- Release notes: https://github.com/actions/github-script/releases
- Compare: https://github.com/actions/github-script/compare/v8...v9

Originally-authored-by: dependabot[bot] <support@github.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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