Normalise output of T10970 test

The output of this test changes each time the containers submodule
version updates. It's easier to apply the version normaliser so that
the test checks that there is a version number, but not which one it is.

testsuite/tests/driver/T10970.hs

 {-# LANGUAGE CPP #-}
 main = do
-    putStrLn VERSION_containers
+    putStrLn ("containers-" ++ VERSION_containers)
 #if MIN_VERSION_base(3,0,0)
     putStrLn "OK"
 #endif

testsuite/tests/driver/T10970.stdout

-0.6.5.1
+containers-0.6.5.1
 OK

testsuite/tests/driver/all.T

@@ -231,7 +231,7 @@ test('T365',
 test('T9360a', req_interp, run_command, ['{compiler} --interactive -e "" -ignore-dot-ghci'])
 test('T9360b', req_interp, run_command, ['{compiler} -e "" --interactive -ignore-dot-ghci'])
 
-test('T10970', normal, compile_and_run, [''])
+test('T10970', [normalise_version('containers')], compile_and_run, [''])
 test('T4931', normal, compile_and_run, [''])
 test('T11182', normal, compile_and_run, [''])
 test('T11381', normal, compile_fail, [''])