Bump py-actions/py-dependency-install from 3 to 4

Bumps [py-actions/py-dependency-install](https://github.com/py-actions/py-dependency-install) from 3 to 4.
- [Release notes](https://github.com/py-actions/py-dependency-install/releases)
- [Changelog](https://github.com/py-actions/py-dependency-install/blob/master/CHANGELOG.md)
- [Commits](py-actions/py-dependency-install@v3...v4)

---
updated-dependencies:
- dependency-name: py-actions/py-dependency-install
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
         restore-keys: |
             pip-lint-
     - name: Install dependencies
-      uses: py-actions/py-dependency-install@v3
+      uses: py-actions/py-dependency-install@v4
       with:
         path: requirements/ci.txt
     - name: Install itself
@@ -101,7 +101,7 @@ jobs:
         restore-keys: |
             pip-ci-${{ runner.os }}-${{ matrix.pyver }}-{{ matrix.no-extensions }}-
     - name: Install dependencies
-      uses: py-actions/py-dependency-install@v3
+      uses: py-actions/py-dependency-install@v4
       with:
         path: requirements/ci.txt
     - name: Cythonize
@@ -160,7 +160,7 @@ jobs:
       with:
         python-version: 3.x
     - name: Install cython
-      uses: py-actions/py-dependency-install@v3
+      uses: py-actions/py-dependency-install@v4
       with:
         path: requirements/ci.txt
     - name: Cythonize
@@ -213,7 +213,7 @@ jobs:
       with:
         python-version: 3.x
     - name: Install cython
-      uses: py-actions/py-dependency-install@v3
+      uses: py-actions/py-dependency-install@v4
       with:
         path: requirements/ci.txt
     - name: Cythonize