Wind back gophercloud to 1.8.0

It triggers a failure in TestOpenstackSDInstanceRefresh.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

go.mod

@@ -31,7 +31,7 @@ require (
 	github.com/google/go-cmp v0.6.0
 	github.com/google/pprof v0.0.0-20240227163752-401108e1b7e7
 	github.com/google/uuid v1.6.0
-	github.com/gophercloud/gophercloud v1.10.0
+	github.com/gophercloud/gophercloud v1.8.0
 	github.com/grafana/regexp v0.0.0-20221122212121-6b5c0a4cb7fd
 	github.com/grpc-ecosystem/grpc-gateway v1.16.0
 	github.com/hashicorp/consul/api v1.28.2

go.sum

@@ -334,8 +334,8 @@ github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
 github.com/googleapis/gax-go/v2 v2.12.2 h1:mhN09QQW1jEWeMF74zGR81R30z4VJzjZsfkUhuHF+DA=
 github.com/googleapis/gax-go/v2 v2.12.2/go.mod h1:61M8vcyyXR2kqKFxKrfA22jaA8JGF7Dc8App1U3H6jc=
-github.com/gophercloud/gophercloud v1.10.0 h1:watRMsaMDlSLuLkpLeLSQ87yvcuwIajNg6A5uLcjoIU=
-github.com/gophercloud/gophercloud v1.10.0/go.mod h1:aAVqcocTSXh2vYFZ1JTvx4EQmfgzxRcNupUfxZbBNDM=
+github.com/gophercloud/gophercloud v1.8.0 h1:TM3Jawprb2NrdOnvcHhWJalmKmAmOGgfZElM/3oBYCk=
+github.com/gophercloud/gophercloud v1.8.0/go.mod h1:aAVqcocTSXh2vYFZ1JTvx4EQmfgzxRcNupUfxZbBNDM=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
 github.com/gorilla/mux v1.6.2/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=