ci: update actions; remove unneded check for go version

Author: alexandear

.github/workflows/ci.yaml

@@ -16,10 +16,10 @@ jobs:
           - "1.20"
           - "1.21"
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Go (${{ matrix.go }}
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v4
       with:
         go-version: ${{ matrix.go }}
 
@@ -30,4 +30,4 @@ jobs:
       run: go test ./...
 
     - name: Tidy (${{ matrix.go }})
-      run: '[[ `go version` < "go version go1.15.10" ]] || go mod tidy'
+      run: go mod tidy