Revert "mockery: s/--version/version/ to fix test"

This reverts commit 0ab1b6b, which
applies to mockery v3 which we isn't yet released (but which we were
building for a little while).

Author: OddBloke

mockery.yaml

@@ -41,5 +41,5 @@ test:
         - posix-libc-utils
   pipeline:
     - runs: |
-        mockery version
+        mockery --version
         mockery --help