build(deps): Bump ibm-cloud-sdk-core from 3.20.6 to 3.21.0

Bumps [ibm-cloud-sdk-core](https://github.com/IBM/python-sdk-core) from 3.20.6 to 3.21.0.
- [Release notes](https://github.com/IBM/python-sdk-core/releases)
- [Changelog](https://github.com/IBM/python-sdk-core/blob/main/CHANGELOG.md)
- [Commits](IBM/python-sdk-core@v3.20.6...v3.21.0)

---
updated-dependencies:
- dependency-name: ibm-cloud-sdk-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pyproject.toml

@@ -7,7 +7,7 @@ name = "ibmcloudant"
 version = "0.9.1"
 description = "Python client library for IBM Cloudant"
 dependencies = [
-  "ibm_cloud_sdk_core==3.20.6",
+  "ibm_cloud_sdk_core==3.21.0",
   "requests>=2.32.2,<3.0.0",
   "python_dateutil>=2.5.3,<3.0.0",
   "PyJWT>=2.0.1,<3.0.0",