fix workflows

Author: matth-x

.github/workflows/documentation.yml

@@ -21,7 +21,7 @@ jobs:
     - uses: actions/setup-python@v4
       with:
         python-version: 3.x
-    - uses: actions/cache@v2
+    - uses: actions/cache@v4
       with:
         key: ${{ github.ref }}
         path: .cache
@@ -79,14 +79,14 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Cache pip
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
         restore-keys: |
           ${{ runner.os }}-pip-
     - name: Cache PlatformIO
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.platformio
         key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
@@ -115,7 +115,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/cache@v2
+    - uses: actions/cache@v4
       with:
         key: ${{ github.ref }}
         path: .cache
@@ -149,7 +149,7 @@ jobs:
     name: Static firmware analysis
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/cache@v2
+    - uses: actions/cache@v4
       with:
         key: ${{ github.ref }}
         path: .cache
@@ -202,7 +202,7 @@ jobs:
     - uses: actions/setup-python@v4
       with:
         python-version: 3.x
-    - uses: actions/cache@v2
+    - uses: actions/cache@v4
       with:
         key: ${{ github.ref }}
         path: .cache

.github/workflows/pio.yml

@@ -22,14 +22,14 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Cache pip
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
         restore-keys: |
           ${{ runner.os }}-pip-
     - name: Cache PlatformIO
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.platformio
         key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}