ci: Update golang ci-lint to v1.51.2

Also, remove the deprecated linters from the .golangci.yml config.

Signed-off-by: David Porter <david@porter.me>

.golangci.yml

@@ -3,8 +3,6 @@ run:
   linters-settings:
     govet:
       enable-all: true
-    golint:
-      min-confidence: 0
     gofmt:
       simplify: true
     goimports:
@@ -17,12 +15,8 @@ linters:
     - staticcheck
     - unused
     - gosimple
-    - structcheck
-    - varcheck
     - ineffassign
-    - deadcode
     - typecheck
-    - golint
     - gofmt
     - goimports
 issues:

Makefile

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 GO := go
-GOLANGCI_VER := v1.48.0
+GOLANGCI_VER := v1.51.2
 GO_TEST ?= $(GO) test $(or $(GO_FLAGS),-race)
 arch ?= $(shell go env GOARCH)