Add task to update changlog file

[kmcginnes]

Updates the PR template to add a task to update the changelog file.

Check List

• [x] I confirm that my contribution is made under the terms of the Apache 2.0 license.
• [ ] I have run pnpm checks to ensure code compiles and meets standards.
• [ ] I have run pnpm test to check if all tests are passing.
• [ ] I have covered new added functionality with unit tests if necessary.
• [ ] I have added an entry in the Changelog.md.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 14.88%. Comparing base (361c4ba) to head (5ee9440). Report is 10 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #362 +/- ## ========================================== + Coverage 13.97% 14.88% +0.90% ========================================== Files 414 415 +1 Lines 30639 30886 +247 Branches 878 948 +70 ========================================== + Hits 4283 4596 +313 + Misses 26026 25962 -64 + Partials 330 328 -2 ``` | [Flag](https://app.codecov.io/gh/aws/graph-explorer/pull/362/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/aws/graph-explorer/pull/362/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | `14.88% <ø> (+0.90%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws#carryforward-flags-in-the-pull-request-comment) to find out more.

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