Make the acceptance tests pass, fixing dependency versions

[neomatrix369]

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Goal or purpose of the PR

Fix the failing tests due to changes in the latest version of language_tool_python and also pandas which conflicts with swifter

Changes implemented in the PR

• Updated reqirements.txt: set minimum version from 2.5.3 to 2.6.1 for language_tool_python
• updated grammar checks test data file
• Updated reqirements.txt: set maximum version of pandas 1.2.5 (< 1.3.0) as higher versions conflict with higher versions of swifter (1.0.5 and onwards)

[codecov[bot]]

Codecov Report

Merging #63 (08bb8c4) into master (7a01d6f) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #63   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines          498       498           
  Branches        74        74           
=========================================
  Hits           498       498           

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