The Debian packaging of git-repair is maintained in git, using the merging
workflow described in dgit-maint-merge(7).  There isn't a patch queue that can
be represented as a quilt series.

A detailed breakdown of the changes is available from their canonical
representation - git commits in the packaging repository.  For example, to see
the changes made by the Debian maintainer in the first upload of upstream
version 1.2.3, you could use:

    % git clone https://git.dgit.debian.org/git-repair
    % cd git-repair
    % git log --oneline 1.2.3..debian/1.2.3-1 -- . ':!debian'

(If you have dgit, use `dgit clone git-repair`, rather than plain `git
clone`.)

A single combined diff, containing all the changes, follows.
--- git-repair-1.20200102.orig/Utility/HumanTime.hs
+++ git-repair-1.20200102/Utility/HumanTime.hs
@@ -44,7 +44,7 @@ daysToDuration :: Integer -> Duration
 daysToDuration i = Duration $ i * dsecs
 
 {- Parses a human-input time duration, of the form "5h", "1m", "5h1m", etc -}
-parseDuration :: Monad m => String -> m Duration
+parseDuration :: MonadFail m => String -> m Duration
 parseDuration = maybe parsefail (return . Duration) . go 0
   where
 	go n [] = return n