chore(deps): update go toolchain directive to v1.26.3

[botty-mcbottington]

This PR contains the following updates:

Package	Type	Update	Change
go (source)	toolchain	minor	1.25.7 → 1.26.3
go		minor	1.25.5 → 1.26.3

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.16%. Comparing base (f29a6d4) to head (cb94c7d).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #292   +/-   ##
=======================================
  Coverage   45.16%   45.16%           
=======================================
  Files          53       53           
  Lines        4886     4886           
=======================================
  Hits         2207     2207           
  Misses       2523     2523           
  Partials      156      156           

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[botty-mcbottington]

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