ci: Update actions/checkout to v5

Signed-off-by: Tim Crawford <[email protected]>

Author: crawfxrd

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     outputs:
       boards: ${{ steps.board-matrix.outputs.boards }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Install dependencies
         run: ./scripts/deps.sh
@@ -31,7 +31,7 @@ jobs:
   mega2560:
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
 
     - name: Install dependencies
       run: |
@@ -50,7 +50,7 @@ jobs:
 
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Install dependencies
         run: ./scripts/deps.sh
@@ -67,7 +67,7 @@ jobs:
         # TODO: Conditionally build based on files changed?
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Install dependencies
         run: ./scripts/deps.sh