fix the deoendency conflict for golang/grpc

with the latest version of google.golang.org/grpc v1.69.0 coming out, the bump failed
because this this version is incompatable with the google.golang.org/grpc/stats/opentelemetry
used by bosh-gcscli.
For now added a replace in the go.mod to not pull in grpc v1.69.0

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/cheggaaa/pb/v3 v3.1.5
 	github.com/cloudfoundry/bosh-agent v0.0.61-0.20230301011448-4cfe06c13ad7
 	github.com/cloudfoundry/bosh-davcli v0.0.383
-	github.com/cloudfoundry/bosh-gcscli v0.0.265
+	github.com/cloudfoundry/bosh-gcscli v0.0.266
 	github.com/cloudfoundry/bosh-s3cli v0.0.335
 	github.com/cloudfoundry/bosh-utils v0.0.510
 	github.com/cloudfoundry/config-server v0.1.222
@@ -36,6 +36,8 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 )
 
+replace google.golang.org/grpc v1.69.0 => google.golang.org/grpc v1.68.1
+
 require (
 	cel.dev/expr v0.19.1 // indirect
 	cloud.google.com/go v0.116.0 // indirect