chore: Update max line length in .deepsource.toml

[pnijhara]

Fixes #6978

Short description of what this resolves:

This PR adds max_line_check = 90 to .deepsource.toml

Changes proposed in this pull request:

By default, DeepSource checks max line length for python file to be 88. However, this can be updated as per the project requirement by adding a line max_line_check under [analyzers.meta] tag in .deepsource.toml.

Refer https://deepsource.io/docs/analyzer/python.html#configuration-deepsource-toml

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

[codecov]

Codecov Report

Merging #6980 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #6980   +/-   ##
============================================
  Coverage        60.87%   60.87%           
============================================
  Files              259      259           
  Lines            13564    13564           
============================================
  Hits              8257     8257           
  Misses            5307     5307           

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[pnijhara]

@prateekj117, please review it.