chore(deps): bump pdm-project/setup-pdm from 3 to 4

Bumps [pdm-project/setup-pdm](https://github.com/pdm-project/setup-pdm) from 3 to 4.
- [Release notes](https://github.com/pdm-project/setup-pdm/releases)
- [Commits](pdm-project/setup-pdm@v3...v4)

---
updated-dependencies:
- dependency-name: pdm-project/setup-pdm
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/pages.yml

@@ -35,7 +35,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Install PDM
-      uses: pdm-project/setup-pdm@v3
+      uses: pdm-project/setup-pdm@v4
       with:
         python-version: '3.10'
         cache: true

.github/workflows/publish.yml

@@ -19,7 +19,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Install PDM
-      uses: pdm-project/setup-pdm@v3
+      uses: pdm-project/setup-pdm@v4
       with:
         python-version: '3.10'
         cache: true

.github/workflows/tests.yml

@@ -26,7 +26,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Install PDM
-      uses: pdm-project/setup-pdm@v3
+      uses: pdm-project/setup-pdm@v4
       with:
         python-version: ${{ matrix.pyversion }}
         cache: true