CI: Use new syntax for setting github output

[akihironitta]

What does this PR do?

Same as Lightning-AI/pytorch-lightning#15415.

weekend chore 🧹

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[krshrimali]

Hi, @akihironitta - Thanks for your PRs to Flash. The CI should be fixed once #1479 is merged. Post that, let's get this one merged as well. Thank you for your patience.

[codecov]

Codecov Report

Base: 92.88% // Head: 92.36% // Decreases project coverage by -0.52% ⚠️

Coverage data is based on head (b88dbaf) compared to base (eb2113a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1477      +/-   ##
==========================================
- Coverage   92.88%   92.36%   -0.53%     
==========================================
  Files         292      292              
  Lines       13080    13158      +78     
==========================================
+ Hits        12149    12153       +4     
- Misses        931     1005      +74     

Flag	Coverage Δ
pytest	13.03% <ø> (?)
tpu	13.03% <ø> (?)
unittests	92.89% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flash/image/segmentation/cli.py	83.33% <0.00%> (-16.67%)	⬇️
flash/pointcloud/detection/cli.py	83.33% <0.00%> (-16.67%)	⬇️
flash/pointcloud/segmentation/cli.py	83.33% <0.00%> (-16.67%)	⬇️
flash/text/question_answering/cli.py	83.33% <0.00%> (-16.67%)	⬇️
flash/audio/speech_recognition/cli.py	83.33% <0.00%> (-16.67%)	⬇️
flash/text/seq2seq/summarization/cli.py	83.33% <0.00%> (-16.67%)	⬇️
flash/image/detection/cli.py	84.61% <0.00%> (-15.39%)	⬇️
flash/audio/classification/cli.py	84.61% <0.00%> (-15.39%)	⬇️
flash/video/classification/cli.py	84.61% <0.00%> (-15.39%)	⬇️
flash/tabular/classification/cli.py	84.61% <0.00%> (-15.39%)	⬇️
... and 27 more

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