build sdist with python 3.13 (point to workflow fork) (#9106)

Author: braingram

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
   build:
     needs: [ check ]
     if: always() && (needs.check.result == 'success' || needs.check.result == 'skipped')
-    uses: OpenAstronomy/github-actions-workflows/.github/workflows/publish.yml@9f1f43251dde69da8613ea8e11144f05cdea41d5  # v1.15.0
+    uses: braingram/github-actions-workflows/.github/workflows/publish.yml@python312_sdist
     with:
       upload_to_pypi: ${{ (github.event_name == 'release') && (github.event.action == 'released') }}
       targets: |

.github/workflows/changelog.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b  # v5.3.0
         with:
-          python-version: 3
+          python-version: 3.12
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
         with:
           fetch-depth: 0