build(deps): bump github.com/Microsoft/hcsshim from 0.12.4 to 0.12.5

Bumps [github.com/Microsoft/hcsshim](https://github.com/Microsoft/hcsshim) from 0.12.4 to 0.12.5.
- [Release notes](https://github.com/Microsoft/hcsshim/releases)
- [Commits](https://github.com/Microsoft/hcsshim/compare/v0.12.4...v0.12.5)

---
updated-dependencies:
- dependency-name: github.com/Microsoft/hcsshim
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

vendor/github.com/Microsoft/hcsshim/hcn/hcnnetwork.go

@@ -73,6 +73,7 @@ const (
 	None                NetworkFlags = 0
 	EnableNonPersistent NetworkFlags = 8
 	DisableHostPort     NetworkFlags = 1024
+	EnableIov           NetworkFlags = 8192
 )
 
 // HostComputeNetwork represents a network