Upgrade GitHub actions/checkout from 4 to 5 (#104)

Author: dependabot[bot]

.github/workflows/codeql-analysis.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v3

.github/workflows/go.yml

@@ -18,7 +18,7 @@ jobs:
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Get dependencies
       run: |
@@ -27,7 +27,7 @@ jobs:
       run: go build -v .
 
     - name: Checkout test XSD
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         repository: xuri/xsd
         path: data