build(deps): bump github.com/alexflint/go-filemutex from 1.1.0 to 1.2.0

Bumps [github.com/alexflint/go-filemutex](https://github.com/alexflint/go-filemutex) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/alexflint/go-filemutex/releases)
- [Commits](https://github.com/alexflint/go-filemutex/compare/v1.1...v1.2.0)

---
updated-dependencies:
- dependency-name: github.com/alexflint/go-filemutex
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

go.mod

@@ -4,7 +4,7 @@ go 1.17
 
 require (
 	github.com/Microsoft/hcsshim v0.9.6
-	github.com/alexflint/go-filemutex v1.1.0
+	github.com/alexflint/go-filemutex v1.2.0
 	github.com/buger/jsonparser v1.1.1
 	github.com/containernetworking/cni v1.0.1
 	github.com/coreos/go-iptables v0.6.0