Remove various deprecations

[wyfo]

No description provided.

[codecov-commenter]

Codecov Report

Merging #351 (a791bac) into master (eb196f8) will increase coverage by 1.64%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master     #351      +/-   ##
==========================================
+ Coverage   86.22%   87.86%   +1.64%     
==========================================
  Files          66       62       -4     
  Lines        5864     5678     -186     
  Branches     1218     1188      -30     
==========================================
- Hits         5056     4989      -67     
+ Misses        591      477     -114     
+ Partials      217      212       -5     

Impacted Files	Coverage Δ
apischema/conversions/__init__.py	100.00% <ø> (+14.28%)	⬆️
apischema/deserialization/__init__.py	99.65% <ø> (-0.01%)	⬇️
apischema/graphql/resolvers.py	84.86% <ø> (-0.10%)	⬇️
apischema/graphql/schema.py	87.02% <ø> (-0.03%)	⬇️
apischema/json_schema/schema.py	85.50% <ø> (-0.09%)	⬇️
apischema/metadata/__init__.py	100.00% <ø> (+12.50%)	⬆️
apischema/schemas.py	80.82% <ø> (+2.89%)	⬆️
apischema/serialization/serialized_methods.py	88.63% <ø> (-0.13%)	⬇️
apischema/settings.py	97.29% <0.00%> (+5.63%)	⬆️
apischema/type_names.py	94.54% <ø> (+3.02%)	⬆️
... and 6 more

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