Bump survey-core from 1.9.122 to 1.12.15

Bumps [survey-core](https://github.com/surveyjs/surveyjs) from 1.9.122 to 1.12.15.
- [Release notes](https://github.com/surveyjs/surveyjs/releases)
- [Changelog](https://github.com/surveyjs/survey-library/blob/master/CHANGELOG.md)
- [Commits](surveyjs/survey-library@v1.9.122...v1.12.15)

---
updated-dependencies:
- dependency-name: survey-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>