Add openmim in requirements/runtime

[KKIEEK]

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Motivation

Related to #141

Modification

Please briefly describe what modification is made in this PR.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[yhna940]

:)

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@b7385cb). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #145   +/-   ##
=======================================
  Coverage        ?   62.59%           
=======================================
  Files           ?       63           
  Lines           ?     2016           
  Branches        ?      314           
=======================================
  Hits            ?     1262           
  Misses          ?      650           
  Partials        ?      104           

Flag	Coverage Δ
unittests	62.59% <0.00%> (?)

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