Update version from 3.1.1 to 3.1.2 in native/cds-bal-template/pom.xml

[Copilot]

This PR fixes a version mismatch issue in the native/cds-bal-template/pom.xml file that was preventing the module from building correctly.

Problem

The cds-bal-template module's pom.xml was referencing parent version 3.1.1, but the root pom.xml had already been updated to version 3.1.2. This caused Maven build failures with the error:

Non-resolvable parent POM for io.ballerina:cds-bal-template:3.1.1: 
The following artifacts could not be resolved: io.ballerina:health-tools:pom:3.1.1 (absent)

Changes

Updated two version references in native/cds-bal-template/pom.xml:

• Parent version from 3.1.1 to 3.1.2 (line 27)
• Artifact version from 3.1.1 to 3.1.2 (line 32)

Verification

• Maven validation passes successfully for the module
• Parent-child POM relationship is now correctly resolved
• Changes are minimal and surgical - only 2 lines modified

This ensures the module builds consistently with the rest of the project at version 3.1.2.

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