Use dev version of citeproc.

This fixes moving of punctuation inside quotes to conform to
the CSL spec: only comma and period are moved, not question
mark or exclamation point.

cabal.project

@@ -7,3 +7,7 @@ source-repository-package
   location: https://github.com/jgm/doctemplates
   tag: 428c26d5303cf7a2b1051fe1ffd9aafe9ba71c81
 
+source-repository-package
+  type: git
+  location: https://github.com/jgm/citeproc
+  tag: d201ddc812b1550d70c3e448eec6d9c3af72d96b

stack.yaml

@@ -13,6 +13,8 @@ extra-deps:
 - skylighting-0.10.5.2
 - git: https://github.com/jgm/doctemplates
   commit: 428c26d5303cf7a2b1051fe1ffd9aafe9ba71c81
+- git: https://github.com/jgm/citeproc
+  commit: d201ddc812b1550d70c3e448eec6d9c3af72d96b
 ghc-options:
    "$locals": -fhide-source-paths -Wno-missing-home-modules
 resolver: lts-18.0