make "resolve_annotations" more lenient, allowing for missing modules

[samuelcolvin]

Make resolve_annotations more lenient, allowing for missing modules

Related issue number

fix #2363

Checklist

• Unit tests for the changes exist
• Tests pass on CI and coverage remains at 100%
• changes/<pull request or issue id>-<github username>.md file added describing change
  (see changes/README.md for details)

[codecov]

Codecov Report

Merging #2366 (0274937) into master (cc3010c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2366   +/-   ##
=======================================
  Coverage   99.97%   99.97%           
=======================================
  Files          23       23           
  Lines        4496     4500    +4     
  Branches      909      909           
=======================================
+ Hits         4495     4499    +4     
  Misses          1        1           

Impacted Files	Coverage Δ
pydantic/typing.py	99.42% <100.00%> (+0.01%)	⬆️

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