flent: add procps dep so checkPhase can succeed

Added missing dependency needed for testing flent (#60360)

authored by ahiaao and committed by Renaud 7d558b2c 2406c06a

+2
+2
pkgs/applications/networking/flent/default.nix
··· 14 14 15 15 buildInputs = [ sphinx ]; 16 16 17 + checkInputs = [ procps ]; 18 + 17 19 propagatedBuildInputs = [ 18 20 matplotlib 19 21 procps