Unbound citeproc (closes #7882).

Author: alaendle

build-constraints.yaml

@@ -7825,9 +7825,6 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/7868
         - postgresql-binary < 0.15
 
-        # https://github.com/commercialhaskell/stackage/issues/7882
-        - citeproc < 0.12
-
         # https://github.com/commercialhaskell/stackage/issues/7879
         - vty-crossplatform < 0.5.0.0