Bump github.com/golangci/golangci-lint from 1.39.0 to 1.40.1 (#190)

Bumps [github.com/golangci/golangci-lint](https://github.com/golangci/golangci-lint) from 1.39.0 to 1.40.1.
- [Release notes](https://github.com/golangci/golangci-lint/releases)
- [Changelog](https://github.com/golangci/golangci-lint/blob/master/CHANGELOG.md)
- [Commits](golangci/golangci-lint@v1.39.0...v1.40.1)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -3,7 +3,7 @@ module github.com/nginxinc/nginx-prometheus-exporter
 go 1.16
 
 require (
-	github.com/golangci/golangci-lint v1.39.0
+	github.com/golangci/golangci-lint v1.40.1
 	github.com/nginxinc/nginx-plus-go-client v0.8.0
 	github.com/prometheus/client_golang v1.10.0
 	github.com/prometheus/common v0.23.0