chore(deps): update dependency go to v4.0.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
go	orb	patch	4.0.2 → 4.0.3

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 8f6c7fa1-5813-4d13-84ae-7cabe44675a5

📥 Commits

Reviewing files that changed from the base of the PR and between 706fae2 and 24a0fc9.

📒 Files selected for processing: 1

• .circleci/config.yml

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 8 remain after this review.

📝 Walkthrough

The CircleCI configuration updates the Go orb version from 4.0.2 to 4.0.3.

Changes: CircleCI Go orb update

Layer / File(s)	Summary
Update Go orb version .circleci/config.yml	The CircleCI configuration changes the Go orb version from 4.0.2 to 4.0.3.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Suggested reviewers: timo-reymann

Merge Risk: ⚪ Minimal · up to 24a0f

This PR only updates the CircleCI Go orb patch version; no concrete merge risk is identified.

### Architecture Summary

Architecture risk: 🔵 Low · up to 24a0f

The changed surface does not map to a changed system, dependency edge, entrypoint, or external dependency.

Changed systems: None identified.

Architecture concerns
No architecture-level concerns identified.

Review details

Before / after behavior

• observed — Modified behavior in .circleci/config.yml: The CircleCI Go orb version changes from 4.0.2 to 4.0.3.

Pre-merge checks: 5

Passed checks: 5 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies a dependency update to version 4.0.3. This matches the CircleCI Go orb update in the pull request.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.81%. Comparing base (706fae2) to head (24a0fc9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #111   +/-   ##
=======================================
  Coverage   90.81%   90.81%           
=======================================
  Files          21       21           
  Lines         294      294           
=======================================
  Hits          267      267           
  Misses         27       27           

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