ci(hypatia-scan): repin reusable to merge-commit SHA (#20)

The wrapper pins to 97df762..., the PR-branch commit on standards#193
that was orphaned after squash-merge. The new pin 915139d7... is the
merge-commit SHA on standards/main; file content is byte-identical.

Estate fix: ~100 repos affected by the same orphan.

<!-- SPDX-License-Identifier: MPL-2.0 -->
## Summary

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with "Closes #N". -->

## Changes

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-

## RSR Quality Checklist

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merged. -->

### Required

- [ ] Tests pass (`just test` or equivalent)
- [ ] Code is formatted (`just fmt` or equivalent)
- [ ] Linter is clean (no new warnings or errors)
- [ ] No banned language patterns (no TypeScript, no npm/bun, no
Go/Python)
- [ ] No `unsafe` blocks without `// SAFETY:` comments
- [ ] No banned functions (`believe_me`, `unsafeCoerce`, `Obj.magic`,
`Admitted`, `sorry`)
- [ ] SPDX license headers present on all new/modified source files
- [ ] No secrets, credentials, or `.env` files included

### As Applicable

- [ ] `.machine_readable/STATE.a2ml` updated (if project state changed)
- [ ] `.machine_readable/ECOSYSTEM.a2ml` updated (if integrations
changed)
- [ ] `.machine_readable/META.a2ml` updated (if architectural decisions
changed)
- [ ] Documentation updated for user-facing changes
- [ ] `TOPOLOGY.md` updated (if architecture changed)
- [ ] `CHANGELOG` or release notes updated
- [ ] New dependencies reviewed for license compatibility (MPL-2.0 /
MPL-2.0)
- [ ] ABI/FFI changes validated (`src/interface/abi/` and
`src/interface/ffi/` consistent)

## Testing

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Author: hyperpolymath