Fix stale.yml syntax error

[ryanio]

workflow was erroring on invalid syntax

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (728b8da) 99.84% compared to head (e4aa429) 99.84%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1267   +/-   ##
=======================================
  Coverage   99.84%   99.84%           
=======================================
  Files          22       22           
  Lines        1322     1322           
  Branches      220      220           
=======================================
  Hits         1320     1320           
  Misses          2        2           

Flag	Coverage Δ
foundry	72.84% <ø> (ø)
production	100.00% <ø> (ø)
reference	100.00% <ø> (ø)

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