DM-39583: Fix lots of deprecation warnings

[timj]

There are still 25 remaining when the tests run but I don't want to fix all the matplotlib problems.

[timj]

I was not expecting a core dump... nosetests does not core dump for me locally (neither does pytest) but I do skip one test.

[coveralls]

Pull Request Test Coverage Report for Build 5601831423

• 78 of 86 (90.7%) changed or added relevant lines in 6 files are covered.
• 9 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 87.29%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
spectractor/extractor/spectrum.py	35	43	81.4%

Files with Coverage Reduction	New Missed Lines	%
spectractor/extractor/chromaticpsf.py	9	90.38%

Totals
Change from base Build 5326706949:	-0.1%
Covered Lines:	7156
Relevant Lines:	8198

---

💛 - Coveralls

[timj]

@mfisherlevine good news is that python 3.11 built everything fine. The 3.10 segv was a bit odd.

[mfisherlevine]

These look fine to me, but give we'll want to upstream these changes, I'd like Jérémy to take a look too. I'll send it to him, and pass on the comments, and then you're good to merge.

[jeremyneveu]

These look fine to me too!