Update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/ddnsb0t.yml

@@ -16,7 +16,7 @@ jobs:
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Download go modules
       run: go mod download

.github/workflows/docker.yml

@@ -8,7 +8,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Build docker image
       run: |
         docker build -t jonpulsifer/ddnsb0t:${{ github.sha }} .

.github/workflows/function.yml

@@ -18,7 +18,7 @@ jobs:
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Download modules
       run: go mod download