chore(ci): bump hypatia-scan-reusable pin off orphan SHA to canonical main

hypatia-scan.yml@97df762 is an orphan PR-branch SHA from
before standards#193 squash-merged as 915139d. The reusable file's
content is identical (no commits to hypatia-scan-reusable.yml since
#193), but cross-checks (cf. standards#220) prefer reachability via
standards/main. Pure hygiene; no behavioural change.

Bumped to standards/main HEAD 5eb28d7.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/hypatia-scan.yml

@@ -25,5 +25,5 @@ permissions:
 
 jobs:
   hypatia:
-    uses: hyperpolymath/standards/.github/workflows/hypatia-scan-reusable.yml@97df762107501909f50bb770e9bc200b6c415600
+    uses: hyperpolymath/standards/.github/workflows/hypatia-scan-reusable.yml@5eb28d7d8790d5389b7b6a5233fe6265a775e3d0
     secrets: inherit