warnings, issue_249, bump deps, etc

[d-chambers]

This PR fixes issue #249 #251, fixes a bunch of warnings, and adds python 10 to the test matrix while eliminating python 3.7.

[d-chambers]

I guess since we aren't testing python 3.7 we ought to drop support for it (it goes EOL in about a year anyhow). Anyone care if we drop python 3.7 support in the next release?

[shawnboltz]

This works for me, I think. I still have one or two setups that are using 3.7, but that's more out of laziness than an actual need.

[d-chambers]

I was thinking specifically about @calum-chamberlain for RT_eqcorrscan as I know you had recently updated most the NIOSH systems. On second thought though, we should probably just support 3.7 until its EoL so we don't force any packages using obsplus to upgrade before they are ready. Maybe we just test 3.7/Ubuntu to keep the test matrix small(ish).

Now to figure out how to get the windows 3.10 conda env to work...

[codecov-commenter]

Codecov Report

Merging #252 (c8108dd) into master (d5b2e46) will increase coverage by 0.13%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
+ Coverage   97.80%   97.93%   +0.13%     
==========================================
  Files          39       39              
  Lines        4642     4648       +6     
  Branches      665      665              
==========================================
+ Hits         4540     4552      +12     
+ Misses         44       42       -2     
+ Partials       58       54       -4     

Flag	Coverage Δ
unittests	97.93% <100.00%> (+0.13%)	:arrow_up:

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

Impacted Files	Coverage Δ
obsplus/bank/eventbank.py	99.54% <100.00%> (ø)
obsplus/bank/wavebank.py	97.26% <100.00%> (+0.78%)	:arrow_up:
obsplus/structures/fetcher.py	98.62% <100.00%> (+<0.01%)	:arrow_up:
obsplus/utils/mseed.py	90.90% <100.00%> (+0.16%)	:arrow_up:
obsplus/utils/stations.py	99.48% <100.00%> (+0.52%)	:arrow_up:
obsplus/events/schema.py	100.00% <0.00%> (ø)
obsplus/events/merge.py	99.23% <0.00%> (+0.76%)	:arrow_up:
obsplus/events/validate.py	94.90% <0.00%> (+1.27%)	:arrow_up:

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