chore(deps): update actions/checkout action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v2 -> v4

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Release Notes

actions/checkout (actions/checkout)

v4

Compare Source

• Check out other refs/* by commit if provided, fall back to ref by @​orhantoy in https://github.com/actions/checkout/pull/1924

v3

Compare Source

• Fix: Mark test scripts with Bash'isms to be run via Bash
• Add option to fetch tags even if fetch-depth > 0

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.20%. Comparing base (61886c2) to head (90745a8).
Report is 2 commits behind head on develop.

❗ Current head 90745a8 differs from pull request most recent head 71ffa96

Please upload reports for the commit 71ffa96 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #170   +/-   ##
========================================
  Coverage    99.20%   99.20%           
========================================
  Files           24       24           
  Lines          500      500           
  Branches        55       55           
========================================
  Hits           496      496           
  Misses           4        4           

Flag	Coverage Δ
guardian-api	97.36% <ø> (ø)
guardian-crypto	100.00% <ø> (ø)
guardian-transactions	99.14% <ø> (ø)

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