Actions: update all workflows to checkout@v4

Author: liamfraser

.github/workflows/cmake.yml

@@ -23,7 +23,7 @@ jobs:
         mkdir -p "${{ github.workspace }}"
 
     - name: Checkout repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Checkout submodules
       run: git submodule update --init

.github/workflows/macOS.yml

@@ -17,7 +17,7 @@ jobs:
           rm -rf "${{ github.workspace }}"
           mkdir -p "${{ github.workspace }}"
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Checkout submodules
         run: git submodule update --init
       - name: Install dependencies

.github/workflows/multi-gcc.yml

@@ -20,7 +20,7 @@ jobs:
         mkdir -p "${{ github.workspace }}"
 
     - name: Checkout repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Checkout submodules
       run: git submodule update --init

.github/workflows/scripts/generate_multi_gcc_workflow.py

@@ -55,7 +55,7 @@
         mkdir -p "${{ github.workspace }}"
 
     - name: Checkout repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Checkout submodules
       run: git submodule update --init

.github/workflows/windows.yml

@@ -17,7 +17,7 @@ jobs:
           echo "Cleaning up previous run"
           rm -rf "${{ github.workspace }}/pico-sdk"
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Checkout submodules
         run: git submodule update --init
       - name: Install dependencies