chore: bump develop to v1.3.40 after v1.3.39

[IgorGanapolsky]

Automated post-release version bump after tag v1.3.39.

develop rejects direct pushes; merge this PR to align develop with the next patch train.

Workflow: https://github.com/IgorGanapolsky/Random-Timer/actions/runs/26335050664

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[gitar-bot]

Code Review ✅ Approved

Bumps the development version to v1.3.40 following the v1.3.39 release. No issues found.

Auto-approved and auto-merge armed: No blocking issues found.
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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