Bump actions/setup-go version

This gets rid of some deprecation warnings on Github Actions.

.github/workflows/ci.yml

@@ -74,7 +74,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Go ${{ matrix.go-version }}
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go-version }}
 
@@ -137,7 +137,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Go ${{ matrix.go-version }}
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go-version }}