[nix] fix yq dependency in tests

nix/frama-c.nix

@@ -46,7 +46,6 @@
 , doxygen
 , python3
 , python3Packages
-, yq
 , cover ? true
 , release_mode ? false
 }:

nix/mk_tests.nix

@@ -26,6 +26,7 @@
 , stdenvNoCC
 , time
 , unixtools
+, yq
 , which
 , wp-cache
 } :
@@ -50,6 +51,7 @@ stdenvNoCC.mkDerivation {
     perl
     time
     unixtools.getopt
+    yq
     which
   ] ++
   (if has-wp-proofs then [ alt-ergo ] else []);