Bump com.sap.cloud.db.jdbc:ngdbc from 2.28.4 to 2.28.6

Bumps com.sap.cloud.db.jdbc:ngdbc from 2.28.4 to 2.28.6.

---
updated-dependencies:
- dependency-name: com.sap.cloud.db.jdbc:ngdbc
  dependency-version: 2.28.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -189,7 +189,7 @@
 
         <!-- JDBC -->
         <mongodb.version>3.12.14</mongodb.version>
-        <ngdbc.version>2.28.4</ngdbc.version>
+        <ngdbc.version>2.28.6</ngdbc.version>
         <snowflake.version>4.0.2</snowflake.version>
         <mysql.version>8.4.0</mysql.version>