ci: fix lighthouse-ci-action version comment (tag is 12.6.2, no v prefix)

zizmor's online ref-version-mismatch audit (not run in the local --no-online
pass) flagged the '# v12.6.2' comment — treosh/lighthouse-ci-action tags have
no 'v' prefix. SHA unchanged; comment corrected to '# 12.6.2'.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: VijitSingh97

.github/workflows/lighthouse.yml

@@ -31,7 +31,7 @@ jobs:
           TZ: UTC
         run: hugo --gc --minify --baseURL "/"
       - name: Lighthouse CI
-        uses: treosh/lighthouse-ci-action@3e7e23fb74242897f95c0ba9cabad3d0227b9b18 # v12.6.2
+        uses: treosh/lighthouse-ci-action@3e7e23fb74242897f95c0ba9cabad3d0227b9b18 # 12.6.2
         with:
           configPath: ./lighthouserc.json
           uploadArtifacts: true # store HTML reports as a GitHub artifact (no third-party upload)