feat: replace obsolete JS media type

[euj1n0ng]

Summary of Changes

A minor fix according to RFC 9239 - Updates to ECMAScript Media Types

Related Issues

Closes #2110

[codecov]

Codecov Report

Merging #2111 (5dda080) into master (c7c790f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #2111   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           62        62           
  Lines         6802      6805    +3     
  Branches      1097      1098    +1     
=========================================
+ Hits          6802      6805    +3     

Impacted Files	Coverage Δ
falcon/constants.py	100.00% <100.00%> (ø)
falcon/response.py	100.00% <100.00%> (ø)

[vytas7]

I think this change warrants a newandimproved news fragment.

[kgriffs]

@vytas7 I can add the news fragment after this is merged if we want to just move forward with this.

[vytas7]

@kgriffs another problem is that this PR, while good-to-go from our side, would probably not address the issue the author had at hand. I wrote a comment on the linked issue. Would you think it would be a good idea to override certain media types with our constants when serving static files to make sure the interpreter's defaults (which may even vary with OS) don't take over?

[vytas7]

Hi again @euj1n0ng, and thanks for this PR! 👍

I've now added a newsfragment, and updated our machinery somewhat to hopefully address WebOfTrust/keripy#316.