Force COLLATE "C" to stabilize ordering in new test_pg_dump queries.

Should have thought of the need for this.

(Local testing suggests that we may still not be out of the
woods, but certainly this much is needed.)

Per buildfarm and David Rowley.

Discussion: https://postgr.es/m/CAApHDvo8pMk5WWFAqwGzuQ-Xh+957W61io_OsCP0oUzqCCODTg@mail.gmail.com

src/test/modules/test_pg_dump/expected/test_pg_dump.out

@@ -70,7 +70,7 @@ SELECT s.obj,
     ELSE a.grantee::regrole::name END,
   a.privilege_type, a.is_grantable
 FROM
-  (SELECT pg_describe_object(classoid,objoid,objsubid) AS obj, initprivs
+  (SELECT pg_describe_object(classoid,objoid,objsubid) COLLATE "C" AS obj, initprivs
    FROM pg_init_privs WHERE privtype = 'e' ORDER BY 1) s,
   aclexplode(s.initprivs) a;
                         obj                         | grantor  |        grantee         | privilege_type | is_grantable 
@@ -207,7 +207,7 @@ SELECT s.obj,
     ELSE a.grantee::regrole::name END,
   a.privilege_type, a.is_grantable
 FROM
-  (SELECT pg_describe_object(classoid,objoid,objsubid) AS obj, initprivs
+  (SELECT pg_describe_object(classoid,objoid,objsubid) COLLATE "C" AS obj, initprivs
    FROM pg_init_privs WHERE privtype = 'e' ORDER BY 1) s,
   aclexplode(s.initprivs) a;
                         obj                         | grantor  |      grantee      | privilege_type | is_grantable 

src/test/modules/test_pg_dump/sql/test_pg_dump.sql

@@ -83,7 +83,7 @@ SELECT s.obj,
     ELSE a.grantee::regrole::name END,
   a.privilege_type, a.is_grantable
 FROM
-  (SELECT pg_describe_object(classoid,objoid,objsubid) AS obj, initprivs
+  (SELECT pg_describe_object(classoid,objoid,objsubid) COLLATE "C" AS obj, initprivs
    FROM pg_init_privs WHERE privtype = 'e' ORDER BY 1) s,
   aclexplode(s.initprivs) a;
 SELECT pg_describe_object(classid,objid,objsubid) AS obj,
@@ -135,7 +135,7 @@ SELECT s.obj,
     ELSE a.grantee::regrole::name END,
   a.privilege_type, a.is_grantable
 FROM
-  (SELECT pg_describe_object(classoid,objoid,objsubid) AS obj, initprivs
+  (SELECT pg_describe_object(classoid,objoid,objsubid) COLLATE "C" AS obj, initprivs
    FROM pg_init_privs WHERE privtype = 'e' ORDER BY 1) s,
   aclexplode(s.initprivs) a;
 SELECT pg_describe_object(classid,objid,objsubid) AS obj,