chore(deps): use go-version-file, drop patch pin (go 1.26)

[joshiste]

Sets go 1.26 in go.mod (drops patch level) and lets setup-go read the version from go.mod via go-version-file (configured in extension-kit reusable CI). Removes the redundant go_version input from ci.yml.

[claude]

Claude finished @joshiste's task in 29s —— View job

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Claude's Review

• Check for previously unresolved review threads (none found)
• Review the diff (go.mod + ci.yml)
• Post final review feedback

Summary: This is a small, low-risk chore PR:

• go.mod: drops the patch pin, go 1.26.5 → go 1.26
• .github/workflows/ci.yml: removes the now-redundant go_version: '^1.26.5' input, relying on the reusable extension-kit CI workflow's go-version-file support to read the version from go.mod

No bugs, security issues, performance concerns, or concurrency issues found. The change is consistent with its stated purpose and the diff is exactly what's described in the PR body. I can't verify the go-version-file behavior in the steadybit/extension-kit reusable workflow itself since that's outside this repo, but the described behavior seems correct and standard for actions/setup-go.

No changes requested.

[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