Re-enable testing of pandoc as it seems to pass

Signed-off-by: Mihai Maruseac <[email protected]>

build-constraints.yaml

@@ -9041,7 +9041,6 @@ expected-test-failures:
     # Misc. Please check if there is a better section before adding more packages here.
     - ghcid # Weird conflicts with sandboxingistributed/distributed-process-supervisor/issues/1
     - hw-kafka-client # missing exe https://github.com/commercialhaskell/stackage/pull/5542
-    - pandoc # https://github.com/jgm/pandoc/issues/5582
     - pcg-random # https://github.com/cchalmers/pcg-random/pull/7
     - persistent-mongoDB # Requires a running server
     - persistent-mysql # https://github.com/commercialhaskell/stackage/issues/4764