test: Set priority for TEST-73-LOCALE

I don't know why yet, but TEST-73-LOCALE can take more than 10
minutes. Until we figure out why, let's give it a higher priority
so it doesn't bottleneck the test run.

test/TEST-73-LOCALE/meson.build

@@ -3,5 +3,6 @@
 integration_tests += [
         integration_test_template + {
                 'name' : fs.name(meson.current_source_dir()),
+                'priority' : 10,
         },
 ]