update CodeQL to v3

[Simulant87]

GitHub actions step "Initialize CodeQL" show following error:

Error: CodeQL Action major versions v1 and v2 have been deprecated. Please update all occurrences of the CodeQL Action in your workflow files to v3. For more information, see https://github.blog/changelog/2025-01-10-code-scanning-codeql-action-v2-is-now-deprecated/

e.g. see: https://github.com/stleary/JSON-java/actions/runs/15887222636/job/44802051034

this is now resolved, see here: https://github.com/stleary/JSON-java/actions/runs/16010002968/job/45165464513

[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

[stleary]

What problem does this code solve?
CodeQL version 2 is deprecated, upgrade to version 3

Does the code still compile with Java6?
This is not a code change

Risks
Low

Changes to the API?
N/A

Will this require a new release?
No

Should the documentation be updated?
No

Does it break the unit tests?
N/A

Was any code refactored in this commit?
N/A

Review status
APPROVED

Starting 3-day comment window