fix RuntimeDatasourceTemplate generic typing

[bz888]

Description

Update generics for RuntimeDatasouceTemplate

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• I have tested locally
• I have performed a self review of my changes
• Updated any relevant documentation
• Linked to any relevant issues
• I have added tests relevant to my changes
• Any dependent changes have been merged and published in downstream modules
• My code is up to date with the base branch
• I have updated relevant changelogs. We suggest using chan

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🔴	Statements	52.65%	3253/6178
🟡	Branches	66.37%	298/449
🔴	Functions	39.33%	94/239
🔴	Lines	52.65%	3253/6178

Test suite run success

51 tests passing in 10 suites.

Report generated by 🧪jest coverage report action from b9b6d56