build: update github action versions (#362)

Maintenance PR to update github action versions.

Author: qued

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       id: virtualenv-cache
       with:
         path: |
@@ -41,7 +41,7 @@ jobs:
     needs: setup
     steps:
     - uses: actions/checkout@v4
-    - uses: actions/cache/restore@v3
+    - uses: actions/cache/restore@v4
       id: virtualenv-cache
       with:
         path: .venv
@@ -71,7 +71,7 @@ jobs:
     needs: [setup, lint]
     steps:
     - uses: actions/checkout@v4
-    - uses: actions/cache/restore@v3
+    - uses: actions/cache/restore@v4
       id: virtualenv-cache
       with:
         path: |