Fix Rails 8.1+ compatibility replacing Benchmark with Process.clock_gettime

[joshRpowell]

In Ruby 3.4+, the Benchmark constant is no longer reliably available
in gem contexts when loaded through Rails 8.1, causing NameError: uninitialized constant Benchmark.

This replaces Benchmark.realtime with Process.clock_gettime, which:

• Is part of Ruby core and doesn't require loading (since ruby 2.x)
• Provides the same monotonic time measurement
• Returns elapsed time in seconds as a Float (identical to Benchmark.realtime)
• Maintains backward compatibility with all existing functionality

Fixes compatibility with:

• Ruby 3.4+
• Rails 8.1+

No behavior changes - Process.clock_gettime(Process::CLOCK_MONOTONIC)
is actually what Benchmark.realtime uses internally.

[FLeinzi]

Hi @joshRpowell,

thanks for figuring out. I extracted your change to a module QueryDiet::Benchmark (easier to test 😉) and added Ruby 3.4.4 and Rails 8.1 to our spec matrix. I will release a new version of the gem soon.

#44

[FLeinzi]

Version 0.7.3 is released now.