Bump cloud.google.com/go/iam from 1.2.0 to 1.2.1 (#1745)

Bumps [cloud.google.com/go/iam](https://github.com/googleapis/google-cloud-go) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/main/documentai/CHANGES.md)
- [Commits](googleapis/google-cloud-go@iot/v1.2.0...iam/v1.2.1)

---
updated-dependencies:
- dependency-name: cloud.google.com/go/iam
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

go.mod

@@ -41,7 +41,7 @@ require (
 
 require (
 	cloud.google.com/go v0.115.1 // indirect
-	cloud.google.com/go/iam v1.2.0
+	cloud.google.com/go/iam v1.2.1
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect

go.sum

@@ -7,8 +7,8 @@ cloud.google.com/go/auth/oauth2adapt v0.2.4 h1:0GWE/FUsXhf6C+jAkWgYm7X9tK8cuEIfy
 cloud.google.com/go/auth/oauth2adapt v0.2.4/go.mod h1:jC/jOpwFP6JBxhB3P5Rr0a9HLMC/Pe3eaL4NmdvqPtc=
 cloud.google.com/go/compute/metadata v0.5.0 h1:Zr0eK8JbFv6+Wi4ilXAR8FJ3wyNdpxHKJNPos6LTZOY=
 cloud.google.com/go/compute/metadata v0.5.0/go.mod h1:aHnloV2TPI38yx4s9+wAZhHykWvVCfu7hQbF+9CWoiY=
-cloud.google.com/go/iam v1.2.0 h1:kZKMKVNk/IsSSc/udOb83K0hL/Yh/Gcqpz+oAkoIFN8=
-cloud.google.com/go/iam v1.2.0/go.mod h1:zITGuWgsLZxd8OwAlX+eMFgZDXzBm7icj1PVTYG766Q=
+cloud.google.com/go/iam v1.2.1 h1:QFct02HRb7H12J/3utj0qf5tobFh9V4vR6h9eX5EBRU=
+cloud.google.com/go/iam v1.2.1/go.mod h1:3VUIJDPpwT6p/amXRC5GY8fCCh70lxPygguVtI0Z4/g=
 cloud.google.com/go/kms v1.19.0 h1:x0OVJDl6UH1BSX4THKlMfdcFWoE4ruh90ZHuilZekrU=
 cloud.google.com/go/kms v1.19.0/go.mod h1:e4imokuPJUc17Trz2s6lEXFDt8bgDmvpVynH39bdrHM=
 cloud.google.com/go/longrunning v0.6.0 h1:mM1ZmaNsQsnb+5n1DNPeL0KwQd9jQRqSqSDEkBZr+aI=