Update dependency @pulumi/github to v5.20.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@pulumi/github (source)	5.19.0 -> 5.20.0

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Release Notes

pulumi/pulumi-github (@​pulumi/github)

### [`v5.20.0`](https://togithub.com/pulumi/pulumi-github/releases/tag/v5.20.0) [Compare Source](https://togithub.com/pulumi/pulumi-github/compare/v5.19.0...v5.20.0) #### Changelog - [`1c80906`](https://togithub.com/pulumi/pulumi-github/commit/1c80906) Update GitHub Actions workflows. ([#​455](https://togithub.com/pulumi/pulumi-github/issues/455)) - [`c5e6fa9`](https://togithub.com/pulumi/pulumi-github/commit/c5e6fa9) Update GitHub Actions workflows. ([#​456](https://togithub.com/pulumi/pulumi-github/issues/456)) - [`4ae6fb7`](https://togithub.com/pulumi/pulumi-github/commit/4ae6fb7) Upgrade terraform-provider-github to v5.39.0 ([#​458](https://togithub.com/pulumi/pulumi-github/issues/458))

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Configuration

📅 Schedule: Branch creation - "every weekend" in timezone Europe/Brussels, Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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