DISPATCH-1528: fix cmake script that finds the tox tool

[kgiusti]

NOTE WELL: fix for DISPATCH-1529 MUST be merged first else the python-checker test cases will fail.

[codecov-io]

Codecov Report

Merging #650 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #650   +/-   ##
=======================================
  Coverage   86.53%   86.53%           
=======================================
  Files          91       91           
  Lines       20654    20654           
=======================================
  Hits        17872    17872           
  Misses       2782     2782

Impacted Files	Coverage Δ
src/router_core/connections.c	94.09% <0%> (-0.34%)	⬇️
src/router_node.c	93.23% <0%> (ø)	⬆️
src/router_core/transfer.c	93.41% <0%> (+0.24%)	⬆️
src/router_core/route_tables.c	76.17% <0%> (+0.49%)	⬆️

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