Python versions in github action YAML examples should be type string, not float

[newmanrs]

Why:

Github action YAML examples on the python/js hybrid doc page have versions using floats, not string. This potentially creates an issue where users editing the examples to python version 3.10 will error after it is parsed as 3.1 (float) and later cast into "3.1" (string).
Fixes #14764, at least for python examples.

What's being changed:

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[welcome]

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[ramyaparimi]

@newmanrs
Thanks so much for opening a PR! I'll get this triaged for review ⚡

[peterbe]

I agree.
It actually works with numbers too, surprisingly.
Example: https://github.com/peterbe/django-fancy-cache/blob/e3cb62ff1474fb2fa839993ec92cc6436839b0c8/.github/workflows/ci.yml#L14
There, 3.10 had to become "3.10" so it wasn't YAML parsed as 3.1 but I much prefer to use quotation marks to avoid the risk in the first place.

👍

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