build(deps): bump github.com/golangci/golangci-lint in /tools

Bumps [github.com/golangci/golangci-lint](https://github.com/golangci/golangci-lint) from 1.49.0 to 1.50.0.
- [Release notes](https://github.com/golangci/golangci-lint/releases)
- [Changelog](https://github.com/golangci/golangci-lint/blob/master/CHANGELOG.md)
- [Commits](golangci/golangci-lint@v1.49.0...v1.50.0)

---
updated-dependencies:
- dependency-name: github.com/golangci/golangci-lint
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

tools/go.mod

@@ -4,7 +4,7 @@ go 1.16
 
 require (
 	github.com/bflad/tfproviderlint v0.28.1
-	github.com/golangci/golangci-lint v1.49.0
+	github.com/golangci/golangci-lint v1.50.0
 	github.com/hashicorp/terraform-plugin-docs v0.13.0
 	golang.org/x/tools v0.1.12
 	mvdan.cc/sh/v3 v3.5.1