Fix panic on bad length for SVCB record

[bluejekyll]

@oherrala had the wrong branch in the other PR, this is correct.

Fixes the panic you discovered.

[codecov]

Codecov Report

Merging #1465 (43167af) into release/0.20 (7965b90) will increase coverage by 0.04%.
The diff coverage is 75.00%.

@@               Coverage Diff                @@
##           release/0.20    #1465      +/-   ##
================================================
+ Coverage         83.66%   83.70%   +0.04%     
================================================
  Files               167      167              
  Lines             15872    15876       +4     
================================================
+ Hits              13279    13288       +9     
+ Misses             2593     2588       -5     

[djc]

Looks good modulo the formatting issue.

(Personally I'd be in favor of renaming the enum variants to comply with upper_case_acronyms, but it'll be a bit of a project.)

[oherrala]

@bluejekyll Thanks. According to my testing this seems to fix the issue!

[bluejekyll]

Personally I'd be in favor of renaming the enum variants to comply with upper_case_acronyms, but it'll be a bit of a project.

I have a note in main that we can do that on the next major release... I'm not totally sure I want to do it, because it's an annoying breaking change without huge benefit, but we can plan it I suppose.