Bump github.com/googleapis/gax-go/v2 from 2.7.1 to 2.8.0

Bumps [github.com/googleapis/gax-go/v2](https://github.com/googleapis/gax-go) from 2.7.1 to 2.8.0.
- [Release notes](https://github.com/googleapis/gax-go/releases)
- [Commits](googleapis/gax-go@v2.7.1...v2.8.0)

---
updated-dependencies:
- dependency-name: github.com/googleapis/gax-go/v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

go.mod

@@ -13,7 +13,7 @@ require (
  github.com/aws/aws-sdk-go v1.44.225
  github.com/go-piv/piv-go v1.11.0
  github.com/golang/mock v1.6.0
- github.com/googleapis/gax-go/v2 v2.7.1
+ github.com/googleapis/gax-go/v2 v2.8.0
  github.com/pkg/errors v0.9.1
  github.com/smallstep/assert v0.0.0-20200723003110-82e2b9b3b262
  github.com/stretchr/testify v1.8.2

go.sum

@@ -84,8 +84,8 @@ github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/enterprise-certificate-proxy v0.2.3 h1:yk9/cqRKtT9wXZSsRH9aurXEpJX+U6FLtpYTdC3R06k=
 github.com/googleapis/enterprise-certificate-proxy v0.2.3/go.mod h1:AwSRAtLfXpU5Nm3pW+v7rGDHp09LsPtGY9MduiEsR9k=
-github.com/googleapis/gax-go/v2 v2.7.1 h1:gF4c0zjUP2H/s/hEGyLA3I0fA2ZWjzYiONAD6cvPr8A=
-github.com/googleapis/gax-go/v2 v2.7.1/go.mod h1:4orTrqY6hXxxaUL4LHIPl6lGo8vAE38/qKbhSAKP6QI=
+github.com/googleapis/gax-go/v2 v2.8.0 h1:UBtEZqx1bjXtOQ5BVTkuYghXrr3N4V123VKJK67vJZc=
+github.com/googleapis/gax-go/v2 v2.8.0/go.mod h1:4orTrqY6hXxxaUL4LHIPl6lGo8vAE38/qKbhSAKP6QI=
 github.com/huandu/xstrings v1.3.3 h1:/Gcsuc1x8JVbJ9/rlye4xZnVAbEkGauT8lbebqcQws4=
 github.com/huandu/xstrings v1.3.3/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
 github.com/imdario/mergo v0.3.11/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=