Use citeproc 0.8.

cabal.project

@@ -3,7 +3,7 @@ tests: True
 flags: +embed_data_files
 constraints: aeson >= 2.0.1.0
 
-source-repository-package
-  type: git
-  location: https://github.com/jgm/citeproc
-  tag: 7874a4ccf1845e5a8a6855c251f1aaea9bf12807
+-- source-repository-package
+--   type: git
+--   location: https://github.com/jgm/citeproc
+--   tag: 7874a4ccf1845e5a8a6855c251f1aaea9bf12807

pandoc.cabal

@@ -476,7 +476,7 @@ library
                  blaze-markup          >= 0.8      && < 0.9,
                  bytestring            >= 0.9      && < 0.12,
                  case-insensitive      >= 1.2      && < 1.3,
-                 citeproc              >= 0.7      && < 0.8,
+                 citeproc              >= 0.8      && < 0.9,
                  commonmark            >= 0.2.2    && < 0.3,
                  commonmark-extensions >= 0.2.3.1  && < 0.3,
                  commonmark-pandoc     >= 0.2.1.2  && < 0.3,

stack.yaml

@@ -39,8 +39,7 @@ extra-deps:
 - commonmark-extensions-0.2.3.1
 - doclayout-0.4
 - doctemplates-0.10.0.2
-- git: https://github.com/jgm/citeproc
-  commit: 7874a4ccf1845e5a8a6855c251f1aaea9bf12807
+- citeproc-0.8
 ghc-options:
    "$locals": -fhide-source-paths -Wno-missing-home-modules
 resolver: lts-18.10