ci: Update version of GH official actions to fix deprecation error.

actions/upload-artifact@v3 stopped working on January 30th 2025:
https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

Author: microbit-carlos

.github/workflows/linux.yml

@@ -22,15 +22,15 @@ jobs:
 
     - name: Cache Python modules
       id: cache-python
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
         restore-keys: |
           ${{ runner.os }}-pip-
 
     - name: Checkout source files
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
 
@@ -48,7 +48,7 @@ jobs:
 
     - name: Cache CCache
       id:   ccache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: .ccache
         key: ${{ runner.os }}-gcc-${{ matrix.gcc }}-${{ hashFiles('log.txt') }}
@@ -70,7 +70,7 @@ jobs:
         (ls -lR firmware_*; ccache -s; arm-none-eabi-gcc -v) | tee log.txt
 
     - name: Upload test artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: firmware-dev-${{github.run_number}}
         path: |

.github/workflows/pr.yml

@@ -22,15 +22,15 @@ jobs:
 
     - name: Cache Python modules
       id: cache-python
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
         restore-keys: |
           ${{ runner.os }}-pip-
 
     - name: Checkout source files
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
 
@@ -46,7 +46,7 @@ jobs:
 
     - name: Cache CCache
       id:   ccache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: .ccache
         key: ${{ runner.os }}-gcc-${{ matrix.gcc }}-${{ hashFiles('log.txt') }}

.github/workflows/windows.yml

@@ -16,15 +16,15 @@ jobs:
         release: ${{ matrix.gcc }}
 
     - name: Cache Python modules
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~\AppData\Local\pip\Cache
         key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
         restore-keys: |
           ${{ runner.os }}-pip-
 
     - name: Checkout source files
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
 
@@ -39,7 +39,7 @@ jobs:
       shell: cmd
 
     - name: Upload test artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: firmware-dev-${{github.run_number}}
         path: |