build(deps): bump com.ibm.cloud:sdk-core from 9.25.0 to 9.26.0

Bumps [com.ibm.cloud:sdk-core](https://github.com/IBM/java-sdk-core) from 9.25.0 to 9.26.0.
- [Release notes](https://github.com/IBM/java-sdk-core/releases)
- [Changelog](https://github.com/IBM/java-sdk-core/blob/main/CHANGELOG.md)
- [Commits](IBM/java-sdk-core@9.25.0...9.26.0)

---
updated-dependencies:
- dependency-name: com.ibm.cloud:sdk-core
  dependency-version: 9.26.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -15,7 +15,7 @@
     <packaging>pom</packaging>
 
     <properties>
-        <sdk-core-version>9.25.0</sdk-core-version>
+        <sdk-core-version>9.26.0</sdk-core-version>
 
         <git-repository-name>cloudant-java-sdk</git-repository-name>