gnu: cgit: Update to 1.1.

* gnu/packages/version-control.scm (cgit): Update to 1.1.
(git@2.9): Rename to...
(git@2.10): ... this.  Update to 2.10.
(cgit)[inputs]: Replace git@2.9 with git@2.10.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>