Update setup-go action to 6.4.0

Author: matsuo

.github/actions/setup-go/action.yaml

@@ -5,7 +5,7 @@ runs:
   using: "composite"
   steps:
     - name: Setup Go
-      uses: actions/setup-go@4dc6199c7b1a012772edbd06daecab0f50c9053c # v6.1.0
+      uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
       with:
         cache: false
         go-version-file: 'go.mod'