chore(deps): bump cloud.google.com/go/longrunning from 0.5.5 to 0.5.6

Bumps [cloud.google.com/go/longrunning](https://github.com/googleapis/google-cloud-go) from 0.5.5 to 0.5.6.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/main/CHANGES.md)
- [Commits](googleapis/google-cloud-go@longrunning/v0.5.5...longrunning/v0.5.6)

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

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

go.mod

@@ -4,7 +4,7 @@ go 1.18
 
 require (
 	cloud.google.com/go/iam v1.1.7
-	cloud.google.com/go/longrunning v0.5.5
+	cloud.google.com/go/longrunning v0.5.6
 	cloud.google.com/go/spanner v1.59.0
 	github.com/google/cel-go v0.20.1
 	go.einride.tech/aip v0.66.0

go.sum

@@ -7,8 +7,8 @@ cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGB
 cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA=
 cloud.google.com/go/iam v1.1.7 h1:z4VHOhwKLF/+UYXAJDFwGtNF0b6gjsW1Pk9Ml0U/IoM=
 cloud.google.com/go/iam v1.1.7/go.mod h1:J4PMPg8TtyurAUvSmPj8FF3EDgY1SPRZxcUGrn7WXGA=
-cloud.google.com/go/longrunning v0.5.5 h1:GOE6pZFdSrTb4KAiKnXsJBtlE6mEyaW44oKyMILWnOg=
-cloud.google.com/go/longrunning v0.5.5/go.mod h1:WV2LAxD8/rg5Z1cNW6FJ/ZpX4E4VnDnoTk0yawPBB7s=
+cloud.google.com/go/longrunning v0.5.6 h1:xAe8+0YaWoCKr9t1+aWe+OeQgN/iJK1fEgZSXmjuEaE=
+cloud.google.com/go/longrunning v0.5.6/go.mod h1:vUaDrWYOMKRuhiv6JBnn49YxCPz2Ayn9GqyjaBT8/mA=
 cloud.google.com/go/spanner v1.59.0 h1:YxcRwgPVktTrRNL005bMh2Q2FpdMOakh0W8ryUwS/yM=
 cloud.google.com/go/spanner v1.59.0/go.mod h1:D2bOAeT/dC6zsZhXRIxbdYa5nQEYU3wYM/1KN3eg7Fs=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=