Bump caltechlibrary/iga from 1 to 18

Bumps [caltechlibrary/iga](https://github.com/caltechlibrary/iga) from 1 to 18.
- [Release notes](https://github.com/caltechlibrary/iga/releases)
- [Changelog](https://github.com/caltechlibrary/iga/blob/develop/CHANGES.md)
- [Commits](caltechlibrary/iga@v1...v18)

---
updated-dependencies:
- dependency-name: caltechlibrary/iga
  dependency-version: '18'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/iga.yaml

@@ -52,7 +52,7 @@ jobs:
     outputs:
       record_doi: ${{steps.iga.outputs.record_doi}}
     steps:
-      - uses: caltechlibrary/iga@v1
+      - uses: caltechlibrary/iga@v18
         id: iga
         with:
           INVENIO_SERVER: ${{env.INVENIO_SERVER}}