ci: fix nonexistent actions/upload-artifact SHA pin (#9)

Replace fabricated pin 65c79d7f54e76e4e3c7a8f34db0f4ac8b515c478 (does not exist in
actions/upload-artifact) with the real v4.6.2 SHA ea165f8d65b6e75b540449e92b4886f43607fa02,
matching the canonical rsr-template-repo / v3-templater pin.
Unblocks 'Set up job' on every affected workflow.

Refs hyperpolymath/standards#48

Co-authored-by: hyperpolymath <hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: hyperpolymath

affinescript/.github/workflows/hypatia-scan.yml

@@ -74,7 +74,7 @@ jobs:
           echo "- Medium: $MEDIUM" >> $GITHUB_STEP_SUMMARY
 
       - name: Upload findings artifact
-        uses: actions/upload-artifact@65c79d7f54e76e4e3c7a8f34db0f4ac8b515c478 # v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: hypatia-findings
           path: hypatia-findings.json