Update .gitignore

[pratyush-1327]

Added pubspec.lock

Closes #1367
Added pubspec.lock to gitignore

Review checklist

• [-] Terms and conditions reflect the current change
• [-] Contains enough appropriate tests
• [-] If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• [-] Properly adds an entry in changelog.md with the change
• [-] If PR includes UI updates/additions, its description has screenshots
• [-] Behavior is as expected
• [-] Clean, well-structured code

[DGoiana]

Hi! @pratyush-1327, thanks for your first contribution. Not adding pubspec.lock to remote was actually a topic that the team discussed a couple of months ago. Check this link to see why we've decided to commit the .lock.

[pratyush-1327]

Oh okay., but the issue was still open for the exact thing so I opened the PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 12%. Comparing base (a0ceb98) to head (e9354de).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1368   +/-   ##
=======================================
  Coverage       12%     12%           
=======================================
  Files          266     266           
  Lines         7198    7198           
=======================================
  Hits           803     803           
  Misses        6395    6395           

[DGoiana]

After discussing it with the team, we agreed on accepting your contribution! Thank you!