SYS-694 fix weewx error message PyMapping_HasKeyString

[instantlinux]

Summary of Changes

For the weewx image, this replaces py3 cheetah package with ct3 version 3.4.0, to get rid of this error seen in 5.4.0 image's logs:

Exception ignored in PyMapping_HasKeyString(); consider using PyMapping_HasKeyStringWithError(), PyMapping_GetOptionalItemString() or PyMapping_GetItemString():
Traceback (most recent call last):
  File "<string>", line 1, in <module>
TypeError: string indices must be integers, not 'str'

A dependabot alert flagged some of the ansible dependencies, so the rest of this PR addresses the ansible-upgrade treadmill: this time the deprecation requires replacing dozens of ansible_foo variable references with ansible_facts['foo'], apparently for entirely gratuitous reasons intended to force extra maintenance burden upon those of us who chose ansible in the first place. (Yeah, this is ridiculous.)

Why is this change being made?

Routine dependency updates. Thanks but no thanks AI, we now run faster on the upgrade treadmill.

How was this tested? How can the reviewer verify your testing?

Local testing.

Completion checklist

• The pull request is linked to all related issues
• This change has unit test coverage
• Documentation has been updated
• Dependencies have been updated and verified