build(deps): bump contentful-sdk-core from 8.1.2 to 8.1.3 (#2230)

Bumps [contentful-sdk-core](https://github.com/contentful/contentful-sdk-core) from 8.1.2 to 8.1.3.
- [Release notes](https://github.com/contentful/contentful-sdk-core/releases)
- [Commits](contentful/contentful-sdk-core@v8.1.2...v8.1.3)

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

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Author: dependabot[bot]