chore(go): fix go version

[jharley]

#545 required an update to "go.mod" such that the go directive went from 1.22 to 1.22.0 in order to appease the compiler.

This was confusing to me, so I opened hashicorp/terraform-plugin-framework#1042 and learned that things had ✨ changed ✨.

Looking at the Go documentation we should be using go get go@1.X when upgrading Go versions, and because the current toolchain directive value will match it is excluded.

For example, the change set in this PR is from running:

$ go get go@1.22
go: upgraded go 1.22.0 => 1.22.7
go: removed toolchain go1.22.7

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.78%. Comparing base (8da3f3b) to head (7a248c0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #546   +/-   ##
=======================================
  Coverage   78.78%   78.78%           
=======================================
  Files          86       86           
  Lines        6124     6124           
=======================================
  Hits         4825     4825           
  Misses        964      964           
  Partials      335      335           

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