build(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] <support@github.com>

.github/workflows/docs.yaml

@@ -16,7 +16,7 @@ jobs:
         with:
           python-version: "3.11"
 
-      - uses: pdm-project/setup-pdm@v3
+      - uses: pdm-project/setup-pdm@v4
         name: Set up PDM
         with:
           python-version: "3.11"

.github/workflows/publish.yaml

@@ -17,7 +17,7 @@ jobs:
         with:
           python-version: "3.11"
 
-      - uses: pdm-project/setup-pdm@v3
+      - uses: pdm-project/setup-pdm@v4
         name: Set up PDM
         with:
           python-version: "3.11"

.github/workflows/test.yaml

@@ -31,7 +31,7 @@ jobs:
         with:
           python-version: ${{ inputs.python-version }}
 
-      - uses: pdm-project/setup-pdm@v3
+      - uses: pdm-project/setup-pdm@v4
         name: Set up PDM
         with:
           python-version: ${{ inputs.python-version }}