chore(deps): update actions/setup-go action to v5 (GoogleCloudPlatform#298)

Co-authored-by: HKWinterhalter <[email protected]>

Author: renovate-bot

.github/workflows/conformance.yml

@@ -41,7 +41,7 @@ jobs:
       run: python -m pip install -e .
 
     - name: Setup Go
-      uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
+      uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # v5.0.0
       with:
         go-version: '1.20'