ci: Update Go version, install action.

Author: Splode

.github/workflows/build.yml

@@ -4,14 +4,12 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [~1.17, ^1]
+        go-version: [~1.19, ^1]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
-    env:
-      GO111MODULE: "on"
     steps:
       - name: Install Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go-version }}
       - name: Checkout code