update link to good first issues (#130759)

Today (Jul 17, 2023), I renamed the `good first contribution` label to `good first issue`. This is because
1) `good first issue` is more commonly used for this intent across GitHub and and thus may be (ever so slightly) more recognizable to potential new contributors, and, more importantly,
2) GitHub recognizes the label `good first issue` when surfacing good first issues in specific places in GitHub[^1].

This PR updates Contributing.md to match the new name.

`grep` did not find any other references to `good first contribution` to update in this repo.

[^1]: [Source (GitHub docs)](https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/encouraging-helpful-contributions-to-your-project-with-labels). Example: https://github.com/flutter/flutter/contribute. If my vague memory serves me correctly, this can also appear in certain emails or the "discovery queue"-type experience that GitHub provides.
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Andrew Kolos 2023-07-17 16:51:14 -07:00 committed by GitHub
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@ -91,7 +91,7 @@ for how to set up your development environment, or ask in #hackers-test on Disco
Developing for Flutter Developing for Flutter
---------------------- ----------------------
If you would prefer to write code, you may wish to start with our list of [good first contributions](https://github.com/flutter/flutter/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+contribution%22). If you would prefer to write code, you may wish to start with our list of [good first issues](https://github.com/flutter/flutter/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22).
To develop for Flutter, you will eventually need to become familiar To develop for Flutter, you will eventually need to become familiar
with our processes and conventions. This section lists the documents with our processes and conventions. This section lists the documents