Upgrade golangci-lint (#606)

* Upgrade golangci-lint to 1.49

* Remove deprecated linters

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
         if: matrix.os == 'ubuntu-20.04'
         uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.48
+          version: v1.49
 
       - name: Test win
         if: matrix.os == 'windows-2022'

.golangci.yml

@@ -10,7 +10,6 @@ linters:
 #    - wastedassign # go1.18
 #    - thelper
     - gofmt
-    - deadcode
     - errcheck
     - gosimple
     - govet
@@ -18,7 +17,6 @@ linters:
     - staticcheck
 #    - structcheck # go1.18
     - unused
-    - varcheck
 #    - gocritic
     - bodyclose # go1.18
     - gosec