liquid-fixpoint testsuite fails outside git (ucsd-progsys/liquid-fixpoint#760)

Author: juhp

build-constraints.yaml

@@ -8902,6 +8902,7 @@ expected-test-failures:
     - katip-wai # 0.2.0.0
     - koji-tool
     - langchain-hs # assumes local HTTP endpoint
+    - liquid-fixpoint # assumes git checkout https://github.com/ucsd-progsys/liquid-fixpoint/issues/760
     - log # ElasticSearch
     - lsp-test # example: lsp-demo-reactor-server: createProcess: posix_spawnp: does not exist (No such file or directory)
     - lz4 # executable not found https://github.com/commercialhaskell/stackage/issues/6226