Expect test failure for mockcat (pujoheadsoft/mockcat#5).

Author: alaendle

build-constraints.yaml

@@ -8113,6 +8113,7 @@ expected-test-failures:
     - lr-acts # 0.1 lr-acts-test: executable not found
     - lsfrom # test: lsfrom does not exist (No such file or directory)
     - markov-chain-usage-model # https://github.com/advancedtelematic/markov-chain-usage-model/issues/44
+    - mockcat # 1.4.1.0 https://github.com/pujoheadsoft/mockcat/issues/5
     - monad-logger-aeson # 0.4.1.3 ghc-9.10.1
     - pvar # 1.0.0.0 ghc-9.6
     - quote-quot # ghc-9.12.3 https://github.com/Bodigrim/quote-quot/issues/9