Bump github.com/hashicorp/nomad from 1.5.5 to 1.5.6

Bumps [github.com/hashicorp/nomad](https://github.com/hashicorp/nomad) from 1.5.5 to 1.5.6.
- [Release notes](https://github.com/hashicorp/nomad/releases)
- [Changelog](https://github.com/hashicorp/nomad/blob/main/CHANGELOG.md)
- [Commits](https://github.com/hashicorp/nomad/compare/v1.5.5...v1.5.6)

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

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

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/google/uuid v1.3.0
 	github.com/gorilla/mux v1.8.0
 	github.com/gorilla/websocket v1.5.0
-	github.com/hashicorp/nomad v1.5.5
+	github.com/hashicorp/nomad v1.5.6
 	github.com/hashicorp/nomad/api v0.0.0-20230314144600-1a01e8719272
 	github.com/influxdata/influxdb-client-go/v2 v2.12.3
 	github.com/mitchellh/mapstructure v1.5.0