fix(ci): update reusable workflow SHAs to @7fdc2705df74b4e352d2a1cde3e87a5923fdf329

Part of estate-wide standards#426 remediation - Batch 12 SHA update.

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

Author: hyperpolymath

.github/workflows/secret-scanner.yml

@@ -18,5 +18,5 @@ jobs:
   scan:
     permissions:
       contents: read
-    uses: hyperpolymath/standards/.github/workflows/secret-scanner-reusable.yml@c65436ee3351cd6b0fa14b142938b195efc77586
+    uses: hyperpolymath/standards/.github/workflows/secret-scanner-reusable.yml@7fdc2705df74b4e352d2a1cde3e87a5923fdf329
     secrets: inherit