Bug#997972: haskell-pandoc-citeproc has been deprecated upstream

[Louis-Philippe Véronneau]

retitle 997972 haskell-pandoc-citeproc not needed, should be RMed
thanks

Hello!

I see that pandoc has been updated (many, many thanks) and the 
aforementioned 'citeproc' package has indeed been packaged as 
"haskell-citeproc".

I see no reason for this package not to be RMed, since the current 
version of pandoc in Sid supports '--citeproc' and fails with the old 
'--filter pandoc-citeproc' anyway:

-----------------------------------------------------------------------
pandoc-citeproc: Error in $: Incompatible API versions: encoded with 
[1,22,2] but attempted to decode with [1,20].
CallStack (from HasCallStack):
   error, called at ./Text/Pandoc/JSON.hs:112:48 in 
pandoc-types-1.20-JP83YEZp4VZ5qbwCPN8866:Text.Pandoc.JSON
Error running filter pandoc-citeproc:
Filter returned error status 1
make: *** [Makefile:6: pdf] Error 83
-----------------------------------------------------------------------

Cheers, and thanks for your work on this.

-- 
   ⢀⣴⠾⠻⢶⣦⠀
   ⣾⠁⢠⠒⠀⣿⡁  Louis-Philippe Véronneau
   ⢿⡄⠘⠷⠚⠋   pollo at debian.org / veronneau.org
   ⠈⠳⣄
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