chore(deps): bump the actions group with 3 updates

Bumps the actions group with 3 updates: [actions/upload-artifact](https://github.com/actions/upload-artifact), [actions/download-artifact](https://github.com/actions/download-artifact) and [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance).


Updates `actions/upload-artifact` from 6 to 7
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...v7)

Updates `actions/download-artifact` from 7 to 8
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v7...v8)

Updates `actions/attest-build-provenance` from 3 to 4
- [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@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/attest-build-provenance
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/nightlies.yml

@@ -33,7 +33,7 @@ jobs:
           nox -s build
           nox -s build_global
 
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@v7
         with:
           name: Packages
           path: dist/*
@@ -44,7 +44,7 @@ jobs:
     needs: [build_wheel]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: Packages
           path: dist

.github/workflows/pip.yml

@@ -72,13 +72,13 @@ jobs:
       run: twine check dist/*
 
     - name: Save standard package
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       with:
         name: standard
         path: dist/pybind11-*
 
     - name: Save global package
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       with:
         name: global
         path: dist/*global-*
@@ -100,10 +100,10 @@ jobs:
 
     steps:
     # Downloads all to directories matching the artifact names
-    - uses: actions/download-artifact@v7
+    - uses: actions/download-artifact@v8
 
     - name: Generate artifact attestation for sdist and wheel
-      uses: actions/attest-build-provenance@v3
+      uses: actions/attest-build-provenance@v4
       with:
         subject-path: "*/pybind11*"