ci: update golangci-lint and add new linters

Bump golangci-lint to v1.43 and add bidichk, contextcheck, ireturn,
nilnil and tenv linters.

Author: Adam Hughes

.circleci/config.yml

@@ -9,7 +9,7 @@ executors:
       - image: node:16-slim
   golangci-lint:
     docker:
-      - image: golangci/golangci-lint:v1.42-alpine
+      - image: golangci/golangci-lint:v1.43-alpine
   golang-previous:
     docker:
       - image: golang:1.16

.golangci.yml

@@ -6,7 +6,9 @@ linters:
   disable-all: true
   enable:
     - asciicheck
+    - bidichk
     - bodyclose
+    - contextcheck
     - deadcode
     - depguard
     - dogsled
@@ -28,14 +30,17 @@ linters:
     - gosimple
     - govet
     - ineffassign
+    - ireturn
     - lll
     - misspell
+    - nilnil
     - nolintlint
     - prealloc
     - revive
     - rowserrcheck
     - staticcheck
     - structcheck
+    - tenv
     - typecheck
     - unconvert
     - unparam