Update ecflow version to 5.11.4 (latest)#881

Merged

climbfuji merged 3 commits intoJCSDA:developfrom

srherbener:bugfix/ecflow-boost-cxx17

Nov 18, 2023

Commits on Nov 17, 2023

Updated ecflow version to latest (5.14.0). Updated spack submodule hash to bugfix for
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Updated spack submodule hash, restored .gitmodules
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Oops - forgot to add the .gitmodules file.
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