update deprecated action dependencies

Author: samuelsadok

.github/workflows/documentation.yml

@@ -24,7 +24,7 @@ jobs:
         print("::set-output name=version::" + version)
     
     - name: Cache pip
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-sphinx-sphinx-tabs-sphinx-design-sphinx_copybutton-sphinx_panels-sphinx_rtd_theme

.github/workflows/firmware.yaml

@@ -84,7 +84,7 @@ jobs:
 
         
       - name: Cache chocolatey
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         if: startsWith(matrix.os, 'windows-')
         with:
           path: C:\Users\runneradmin\AppData\Local\Temp\chocolatey\gcc-arm-embedded