Fix CI workflow to use go-version-file instead of hardcoded Go version (#121)

Author: jlegrone

.github/workflows/test-integration.yml

@@ -17,7 +17,8 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
-        go-version: '1.21'
+        go-version-file: 'go.mod'
+        check-latest: true
         cache: true
 
     - name: Install Temporal CLI
@@ -70,7 +71,8 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
-        go-version: '1.21'
+        go-version-file: 'go.mod'
+        check-latest: true
         cache: true
 
     - name: Download dependencies
@@ -100,11 +102,12 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
-        go-version: '1.21'
+        go-version-file: 'go.mod'
+        check-latest: true
         cache: true
 
     - name: Download dependencies
       run: go mod download
 
     - name: Run go vet
-      run: go vet ./... 
+      run: go vet ./...