bump ci actions versions, golangcilint version

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         id: go
 
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: start Redis
         uses: supercharge/redis-github-action@1.4.0
@@ -35,13 +35,13 @@ jobs:
 
       - name: install golangci-lint and goveralls
         run: |
-          curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh| sh -s -- -b $GITHUB_WORKSPACE v1.47.2
+          curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $GITHUB_WORKSPACE v1.50.1
           go install github.com/mattn/goveralls@latest
 
       - name: run linters
         run: $GITHUB_WORKSPACE/golangci-lint run --out-format=github-actions
 
       - name: submit coverage
-        run: $(go env GOPATH)/bin/goveralls -service="github" -coverprofile=$GITHUB_WORKSPACE/profile.cov
+        run: goveralls -service="github" -coverprofile=$GITHUB_WORKSPACE/profile.cov
         env:
           COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.golangci.yml

@@ -26,18 +26,14 @@ linters:
     - revive
     - govet
     - unconvert
-    - megacheck
-    - structcheck
     - gas
     - gocyclo
     - dupl
     - misspell
     - unparam
-    - varcheck
-    - deadcode
+    - unused
     - typecheck
     - ineffassign
-    - varcheck
     - stylecheck
     - gochecknoinits
     - exportloopref