Bump OpenAstronomy/github-actions-workflows

Bumps the actions group in /.github/workflows with 1 update: [OpenAstronomy/github-actions-workflows](https://github.com/openastronomy/github-actions-workflows).


Updates `OpenAstronomy/github-actions-workflows` from 1.14.0 to 1.15.0
- [Release notes](https://github.com/openastronomy/github-actions-workflows/releases)
- [Commits](OpenAstronomy/github-actions-workflows@d68193b...9f1f432)

---
updated-dependencies:
- dependency-name: OpenAstronomy/github-actions-workflows
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   test:
-    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@d68193b68216da64eafaa618f53c59f5d271c56e  # v1.14.0
+    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@9f1f43251dde69da8613ea8e11144f05cdea41d5  # v1.15.0
     with:
       envs: |
         - linux: py311-astropystable