use graph.nodes(data='payload') to simpify code

[CJ-Wright]

see https://networkx.github.io/documentation/stable/reference/classes/generated/networkx.Graph.nodes.html#networkx.Graph.nodes

[codecov]

Codecov Report

Merging #1036 into master will increase coverage by 0.16%.
The diff coverage is 55.38%.

@@            Coverage Diff             @@
##           master    #1036      +/-   ##
==========================================
+ Coverage   62.71%   62.88%   +0.16%     
==========================================
  Files          51       51              
  Lines        4624     4642      +18     
==========================================
+ Hits         2900     2919      +19     
+ Misses       1724     1723       -1     

Impacted Files	Coverage Δ
conda_forge_tick/auto_tick.py	0.00% <0.00%> (ø)
conda_forge_tick/make_graph.py	45.45% <0.00%> (ø)
conda_forge_tick/migrators/core.py	73.18% <ø> (ø)
conda_forge_tick/migrators/migration_yaml.py	64.64% <0.00%> (+0.32%)	⬆️
conda_forge_tick/status_report.py	0.00% <0.00%> (ø)
conda_forge_tick/update_upstream_versions.py	31.75% <0.00%> (+0.07%)	⬆️
conda_forge_tick/contexts.py	69.23% <69.23%> (+1.30%)	⬆️
tests/test_audit.py	100.00% <0.00%> (ø)
conda_forge_tick/audit.py	62.06% <0.00%> (+6.25%)	⬆️

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