Bump mantid to 6.14

[ghost]

Description of work:

Bumps mantid dependency to 6.14

Check all that apply:

• updated documentation
• Source added/refactored
• Added unit tests
• Added integration tests
• Verified that tests requiring the /SNS and /HFIR filesystems pass without fail

References:

• Links to IBM EWM items: 13286: Update lr_reduction to mantid 6.14
• Links to related issues or pull requests:

⚠️ Manual test for the reviewer

(Instructions for testing here)

Check list for the reviewer

• best software practices
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.23%. Comparing base (61b7b62) to head (35e9027).

Additional details and impacted files

@@            Coverage Diff             @@
##             next      #92      +/-   ##
==========================================
- Coverage   87.30%   87.23%   -0.07%     
==========================================
  Files          25       25              
  Lines        2867     2867              
==========================================
- Hits         2503     2501       -2     
- Misses        364      366       +2     

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[backmari]

can you please add a link to the EWM item in the PR description and vice versa?