chore: Add Pushpay as a public reference

[hjgraca]

Please provide the issue number

Issue number: #631

Summary

Changes

Lance French, Engineering Manager, opened a https://github.com/aws-powertools/powertools-lambda-dotnet/issues/631 to add Pushpay as a public reference for Powertools for AWS Lambda.

User experience

Please share what the user experience looks like before and after this change

Checklist

Please leave checklist items unchecked if they do not apply to your change.

• [ ] Meets tenets criteria
• [ ] I have performed a self-review of this change
• [ ] Changes have been tested
• [ ] Changes are documented
• [ ] PR title follows conventional commit semantics

Is this a breaking change?

**RFC issue number**: Checklist: * [ ] Migration process documented * [ ] Implement warnings (if it can live side by side)

Acknowledgment

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

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

Project coverage is 72.72%. Comparing base (00d7c76) to head (a7da243). Report is 14 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #633 +/- ## ======================================== Coverage 72.72% 72.72% ======================================== Files 190 190 Lines 7874 7874 Branches 850 850 ======================================== Hits 5726 5726 Misses 1858 1858 Partials 290 290 ``` | [Flag](https://app.codecov.io/gh/aws-powertools/powertools-lambda-dotnet/pull/633/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws-powertools) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/aws-powertools/powertools-lambda-dotnet/pull/633/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws-powertools) | `72.72% <ø> (ø)` | | 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-powertools#carryforward-flags-in-the-pull-request-comment) to find out more.

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