Re: [PATCH] t5606: run clone branch name test with protocol v2

> 4f37d45706 ("clone: respect remote unborn HEAD", 2021-02-05) introduces
> a new feature (if the remote has an unborn HEAD, e.g. when the remote
> repository is empty, use it as the name of the branch) that only works
> in protocol v2, but did not ensure that one of its tests always uses
> protocol v2, and thus that test would fail if
> GIT_TEST_PROTOCOL_VERSION=0 (or 1) is used. Therefore, add "-c
> protocol.version=2" to the appropriate test.
> 
> (The rest of the tests from that commit have "-c protocol.version=2"
> already added.)