Attest package provenance (#12333)

Use the new build provenance support added in [build-and-inspect-python-package 2.5.0](https://github.com/hynek/build-and-inspect-python-package/blob/main/CHANGELOG.md#250---2024-05-13).

More information: https://github.blog/2024-05-02-introducing-artifact-attestations-now-in-public-beta/

Tested also in https://github.com/pytest-dev/pytest-mock/pull/431.

Note: even though it is technically necessary only for the `deploy` workflow, as the `test` workflow does not publish its packages, decided to always attest the provenance in both cases to avoid any surprises related to this (say a misconfiguration) when deploying.

.github/workflows/deploy.yml

@@ -19,6 +19,11 @@ jobs:
       SETUPTOOLS_SCM_PRETEND_VERSION: ${{ github.event.inputs.version }}
     timeout-minutes: 10
 
+    # Required by attest-build-provenance-github.
+    permissions:
+      id-token: write
+      attestations: write
+
     steps:
     - uses: actions/checkout@v4
       with:
@@ -26,7 +31,9 @@ jobs:
         persist-credentials: false
 
     - name: Build and Check Package
-      uses: hynek/build-and-inspect-python-package@v2.4.0
+      uses: hynek/build-and-inspect-python-package@v2.5.0
+      with:
+        attest-build-provenance-github: 'true'
 
   deploy:
     if: github.repository == 'pytest-dev/pytest'

.github/workflows/test.yml

@@ -35,7 +35,7 @@ jobs:
         fetch-depth: 0
         persist-credentials: false
     - name: Build and Check Package
-      uses: hynek/build-and-inspect-python-package@v2.4.0
+      uses: hynek/build-and-inspect-python-package@v2.5.0
 
   build:
     needs: [package]