Update flesnet version

The current flesnet version contain all changes/patches which we did so far when compiling CbmRoot. The new flesnet version also needs un updated version of cppzmq. refs. #2068, #2069

@p.-a.loizeau,

could you run some tests with the new flesnet version or is the usage included in our extended test suite.

Dear @f.uhlig, @v.friese, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

resolved all threads

approved this merge request

added 5 commits

• e0635f26...c896d5c7 - 4 commits from branch computing:master
• 197cb9a7 - Update flesnet version

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merged