Remove unneeded c++ versions in get_stdopt

[mcbarton]

Description

Please include a summary of changes, motivation and context for this PR.

We don't support c++11 or c++14 kernels anymore, so these lines are unneeded

Fixes # (issue)

Type of change

Please tick all options which are relevant.

• Bug fix
• New feature
• Added/removed dependencies
• Required documentation updates

[anutosh491]

Well the user can still configure their kernels to use those versions right ?

I guess we should still keep them !

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.77%. Comparing base (c7628c6) to head (dbd4d9e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #399      +/-   ##
==========================================
- Coverage   81.78%   81.77%   -0.02%     
==========================================
  Files          20       20              
  Lines         950      845     -105     
  Branches       87       87              
==========================================
- Hits          777      691      -86     
+ Misses        173      154      -19     

Files with missing lines	Coverage Δ
src/xinterpreter.cpp	90.56% <ø> (+0.45%)	⬆️

... and 13 files with indirect coverage changes

Files with missing lines	Coverage Δ
src/xinterpreter.cpp	90.56% <ø> (+0.45%)	⬆️

... and 13 files with indirect coverage changes

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[mcbarton]

Well the user can still configure their kernels to use those versions right ?

I guess we should still keep them !

Closing as per this comment

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"