build(deps): bump contentful-sdk-core from 8.1.4 to 8.1.5 (#2270)

Bumps [contentful-sdk-core](https://github.com/contentful/contentful-sdk-core) from 8.1.4 to 8.1.5.
- [Release notes](https://github.com/contentful/contentful-sdk-core/releases)
- [Commits](contentful/contentful-sdk-core@v8.1.4...v8.1.5)

---
updated-dependencies:
- dependency-name: contentful-sdk-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>