chore(deps): bump the actions group with 2 updates

Bumps the actions group with 2 updates: [pypa/cibuildwheel](https://github.com/pypa/cibuildwheel) and [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance).


Updates `pypa/cibuildwheel` from 2.20 to 2.21
- [Release notes](https://github.com/pypa/cibuildwheel/releases)
- [Changelog](https://github.com/pypa/cibuildwheel/blob/main/docs/changelog.md)
- [Commits](pypa/cibuildwheel@v2.20...v2.21)

Updates `actions/attest-build-provenance` from 1.4.2 to 1.4.3
- [Release notes](https://github.com/actions/attest-build-provenance/releases)
- [Changelog](https://github.com/actions/attest-build-provenance/blob/main/RELEASE.md)
- [Commits](actions/attest-build-provenance@6149ea5...1c608d1)

---
updated-dependencies:
- dependency-name: pypa/cibuildwheel
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: actions/attest-build-provenance
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

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

.github/workflows/emscripten.yaml

@@ -24,7 +24,7 @@ jobs:
           submodules: true
           fetch-depth: 0
 
-      - uses: pypa/cibuildwheel@v2.20
+      - uses: pypa/cibuildwheel@v2.21
         env:
           CIBW_PLATFORM: pyodide
 

.github/workflows/tests.yml

@@ -128,7 +128,7 @@ jobs:
 
       - uses: yezz123/setup-uv@v4
 
-      - uses: pypa/cibuildwheel@v2.20
+      - uses: pypa/cibuildwheel@v2.21
         with:
           only: "${{ matrix.only }}"
         env:

.github/workflows/wheels.yml

@@ -57,7 +57,7 @@ jobs:
         with:
           platforms: all
 
-      - uses: pypa/cibuildwheel@v2.20
+      - uses: pypa/cibuildwheel@v2.21
         env:
           CIBW_BUILD: cp${{ matrix.python }}-manylinux_*
           CIBW_ARCHS: ${{ matrix.arch }}
@@ -120,7 +120,7 @@ jobs:
         with:
           python-version: 3.8
 
-      - uses: pypa/cibuildwheel@v2.20
+      - uses: pypa/cibuildwheel@v2.21
         env:
           CIBW_BUILD: ${{ matrix.build }}
           CIBW_ARCHS: ${{ matrix.arch }}
@@ -159,7 +159,7 @@ jobs:
         run: ls -lh dist
 
       - name: Generate artifact attestation for sdist and wheels
-        uses: actions/attest-build-provenance@6149ea5740be74af77f260b9db67e633f6b0a9a1 # v1.4.2
+        uses: actions/attest-build-provenance@1c608d11d69870c2092266b3f9a6f3abbf17002c # v1.4.3
         with:
           subject-path: "dist/boost_histogram-*"