fix: Wrap HEAD request in a try-catch to prevent watch mode crashes on server reloads

[Matsuuu]

A quick fix on the problem discussed at #1542 (comment)

I'm not sure if this is the best approach, but I didn't want to go fiddling around with the json-schema-ref-parser library, which is causing the actual error to pop up so I wrote this and tested it out and it seemed to run without a hitch.

I also decided to pass the exception message to the response body but idk if that's what we want to do here.

Tested locally against the repro I posted here and another project and couldn't get it to crash.

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Latest commit: 7326d25

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Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 57.14%. Comparing base (c319ba3) to head (7326d25).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/openapi-ts/src/getSpec.ts	0.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1748      +/-   ##
==========================================
- Coverage   57.15%   57.14%   -0.02%     
==========================================
  Files         191      191              
  Lines       25720    25728       +8     
  Branches     1913     1913              
==========================================
  Hits        14701    14701              
- Misses      11010    11018       +8     
  Partials        9        9              

Flag	Coverage Δ
unittests	57.14% <0.00%> (-0.02%)	⬇️

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commit: 7326d25