Depend on PostgreSQL token server if building PostgreSQL sync server

Author: ntninja

syncserver/Cargo.toml

@@ -70,7 +70,7 @@ slog-journald = "2.2.0"
 default = ["mysql", "py_verifier"]
 no_auth = []
 py_verifier = ["tokenserver-auth/py", "tokenserver-common/py"]
-mysql = ["syncstorage-db/mysql"]
-postgres = ["syncstorage-db/postgres"]
-spanner = ["syncstorage-db/spanner"]
+mysql = ["syncstorage-db/mysql", "tokenserver-db/mysql"]
+postgres = ["syncstorage-db/postgres", "tokenserver-db/postgres"]
+spanner = ["syncstorage-db/spanner", "tokenserver-db/mysql"]
 actix-compress = ["actix-web/compress-brotli", "actix-web/compress-gzip", "actix-web/compress-zstd"]

tokenserver-db/Cargo.toml

@@ -25,6 +25,5 @@ temp-env.workspace = true
 syncserver-settings = { path = "../syncserver-settings" }
 
 [features]
-default = ["mysql"]
 mysql = ['tokenserver-mysql']
 postgres = ['tokenserver-postgres']