allow fortran-src testsuite failure (camfort/fortran-src#293)

build-constraints.yaml

@@ -8643,6 +8643,7 @@ expected-test-failures:
     - cryptohash # 0.11.9 Stack builds test and benchmarks in one pass so benchmark could prevent tests from getting built
     - do-notation # 0.1.0.2
     - fields-and-cases # 0.2.0.0 https://github.com/m-bock/fields-and-cases/issues/1
+    - fortran-src # 0.16.3 https://github.com/camfort/fortran-src/issues/293
     - generic-lens # https://github.com/commercialhaskell/stackage/issues/6377
     - ghc-byteorder # 4.11.0.0.10 https://github.com/haskell-hvr/ghc-byteorder/issues/1
     - ghc-prof # Regression tests: /usr/bin/ld.gold: error: cannot find -lHStemporary-1.3-51ST9z47bmaL2YkhqqBGqn_p ...