deps: update supervisor to version 4.2.5.

[jiceatscion]

The old version depends on the asynchat std module, which has been removed from python 3.12.

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This change is 

[matzf]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @jiceatscion)

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tools/env/pip3/requirements.txt line 70 at r1 (raw file):

# The following packages are considered to be unsafe in a requirements file:
setuptools==69.1.0 \

Just for the record; this setuptools version is not compatible with ancient python 3.6, and thus the install dependency script will no longer work on also ancient Ubuntu 18.04.
This seems ok. If necessary, it can still be made to work easily by changing this requirement to an older version of setuptools.