remove deprecated golangci-lint linters

Linters 'deadcode' and 'varcheck' are deprecated since v1.49.0
and had been replaced by 'unused'

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.golangci.yml

@@ -11,13 +11,11 @@ linters:
   enable:
     - gofmt
     - govet
-    - deadcode
     - depguard
     - goimports
     - ineffassign
     - misspell
     - unused
-    - varcheck
     - revive
     - staticcheck
     - typecheck