Fix gnnheterographs failed test

[aurorarossi]

With this PR I fixed the print order of Dicts and the gnnheterographs tests should now not fail.

[codecov[bot]]

Codecov Report

Merging #241 (96a7d08) into master (156cfae) will increase coverage by 0.12%. The diff coverage is 93.75%.

@@            Coverage Diff             @@
##           master     #241      +/-   ##
==========================================
+ Coverage   88.29%   88.42%   +0.12%     
==========================================
  Files          16       16              
  Lines        1589     1624      +35     
==========================================
+ Hits         1403     1436      +33     
- Misses        186      188       +2     

Impacted Files	Coverage Δ
src/GNNGraphs/gnnheterograph.jl	85.91% <93.75%> (+4.09%)	:arrow_up:
src/GNNGraphs/query.jl	94.02% <0.00%> (+0.27%)	:arrow_up:

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[aurorarossi]

(I will open another PR for the laplacian_lambda_max error)