Drop ASM dependency from NullGaurdsTest

[jack-berg]

Now that we use java 25 for the build, we can drop the asm dependency and in favor of built in java.lang.classfile.* classes.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.67%. Comparing base (e7e3c7e) to head (2db604d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8954      +/-   ##
============================================
+ Coverage     90.65%   90.67%   +0.01%     
- Complexity    10889    10893       +4     
============================================
  Files          1015     1015              
  Lines         29741    29741              
  Branches       3878     3878              
============================================
+ Hits          26963    26967       +4     
  Misses         1860     1860              
+ Partials        918      914       -4     

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[jkwatson]

tiniest nit: I know this is just a key, but maybe a ':' in between the method and type?