CI: update cache and checkout to v4

This syncs the github actions for the MMU project with
the MK3 project

.github/workflows/build.yml

@@ -20,21 +20,21 @@ jobs:
 
     # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
     - name: Checkout ${{ github.event.pull_request.head.ref }}
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       if: ${{ github.event.pull_request }}
       with:
         ref: ${{ github.event.pull_request.head.sha }}
         submodules: true
 
     - name: Checkout ${{ github.event.ref }}
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       if: ${{ !github.event.pull_request }}
       with:
         ref: ${{ github.event.ref }}
         submodules: true
 
     - name: Cache Dependencies
-      uses: actions/cache@v3.0.11
+      uses: actions/cache@v4.0.0
       id: cache-pkgs
       with:
           path: ".dependencies"
@@ -77,21 +77,21 @@ jobs:
 
     # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
     - name: Checkout ${{ github.event.pull_request.head.ref }}
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       if: ${{ github.event.pull_request }}
       with:
         ref: ${{ github.event.pull_request.head.sha }}
         submodules: true
 
     - name: Checkout ${{ github.event.ref }}
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       if: ${{ !github.event.pull_request }}
       with:
         ref: ${{ github.event.ref }}
         submodules: true
 
     - name: Cache Dependencies
-      uses: actions/cache@v3.0.11
+      uses: actions/cache@v4.0.0
       id: cache-pkgs
       with:
           path: ".dependencies"

.github/workflows/pr-size.yml

@@ -23,10 +23,10 @@ jobs:
 
     # build the base branch
     - name: Checkout base
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Cache Dependencies
-      uses: actions/cache@v3.0.11
+      uses: actions/cache@v4.0.0
       id: cache-pkgs
       with:
           path: ".dependencies"
@@ -54,7 +54,7 @@ jobs:
 
     # build the PR branch
     - name: Checkout PR
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         clean: false
         ref: ${{ github.event.pull_request.head.sha }}