Upgrade disco clients

Disco configs now support Environment variable expansion.

go.mod

@@ -21,7 +21,7 @@ require (
 	github.com/mkideal/pkg v0.1.3
 	github.com/rqlite/go-sqlite3 v1.27.1
 	github.com/rqlite/raft-boltdb v0.0.0-20230223205721-b72e0bf63c4d
-	github.com/rqlite/rqlite-disco-clients v0.0.0-20230223142702-e7b84b86c5e1
+	github.com/rqlite/rqlite-disco-clients v0.0.0-20230505011544-70f7602795ff
 	github.com/rqlite/sql v0.0.0-20221103124402-8f9ff0ceb8f0
 	go.etcd.io/bbolt v1.3.7
 	go.etcd.io/etcd/client/v3 v3.5.8 // indirect

go.sum

@@ -1022,8 +1022,8 @@ github.com/rqlite/go-sqlite3 v1.27.1 h1:BZMF7lB7kflMgWbULsM8TpKHM9vzcINEknbe0YC6
 github.com/rqlite/go-sqlite3 v1.27.1/go.mod h1:nd4ooHtz396nqTudi+5u7stMN8EEkHjceyUARVYOceY=
 github.com/rqlite/raft-boltdb v0.0.0-20230223205721-b72e0bf63c4d h1:wH94vVVtdtoPEAFIwuI2L46BPVNe910W5CSeLqfrl7w=
 github.com/rqlite/raft-boltdb v0.0.0-20230223205721-b72e0bf63c4d/go.mod h1:onqyEy/cyiI41YboFJpfRqYL54Sd1HB0X/vaDj7eZeo=
-github.com/rqlite/rqlite-disco-clients v0.0.0-20230223142702-e7b84b86c5e1 h1:VpkBFpaovYdXLC+gKOmApgW8wrsNVQ7hWmb+y6HydS8=
-github.com/rqlite/rqlite-disco-clients v0.0.0-20230223142702-e7b84b86c5e1/go.mod h1:pym85nj6JnCI7rM9RxTZ4cubkTQyyg7uLwVydso9B80=
+github.com/rqlite/rqlite-disco-clients v0.0.0-20230505011544-70f7602795ff h1:NRe0uU1s3f2nYMV+xaASReg0w13FR+pLMn/kVUSuao4=
+github.com/rqlite/rqlite-disco-clients v0.0.0-20230505011544-70f7602795ff/go.mod h1:pym85nj6JnCI7rM9RxTZ4cubkTQyyg7uLwVydso9B80=
 github.com/rqlite/sql v0.0.0-20221103124402-8f9ff0ceb8f0 h1:C8DZB5okjhCSd7zvkOM+zxGz7S6ulUFIL34bpkqFk+0=
 github.com/rqlite/sql v0.0.0-20221103124402-8f9ff0ceb8f0/go.mod h1:ib9zVtNgRKiGuoMyUqqL5aNpk+r+++YlyiVIkclVqPg=
 github.com/ruudk/golang-pdf417 v0.0.0-20181029194003-1af4ab5afa58/go.mod h1:6lfFZQK844Gfx8o5WFuvpxWRwnSoipWe/p622j1v06w=