Fix errors in contributing.rst for setup · jupyterlab/jupyter-collaboration@a7ef73d

The following actions uses node12 which is deprecated and will be forced to run on node16: pre-commit/action@v2.0.0. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v3, actions/setup-python@v4, pre-commit/action@v2.0.0. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Lint frontend: packages/collaboration/src/collaboratorspanel.tsx#L105

Forbidden non-null assertion

Lint frontend: packages/collaboration/src/collaboratorspanel.tsx#L168

Forbidden non-null assertion

Lint frontend: packages/collaboration/src/cursors.ts#L171

Forbidden non-null assertion

Lint frontend: packages/collaboration/src/cursors.ts#L235

Forbidden non-null assertion

Lint frontend: packages/collaboration/src/cursors.ts#L286

Forbidden non-null assertion

Lint frontend: packages/collaboration/src/menu.ts#L65

Forbidden non-null assertion

Lint frontend: packages/collaboration/src/menu.ts#L70

Forbidden non-null assertion

Lint frontend: packages/collaboration/src/menu.ts#L76

Forbidden non-null assertion

Lint frontend: packages/collaboration/src/menu.ts#L78

Forbidden non-null assertion

Lint frontend: packages/collaboration/src/userinfopanel.tsx#L26

Forbidden non-null assertion

The following artifacts were uploaded using a version of actions/upload-artifact that is scheduled for deprecation: "jupyter-collaboration-playwright-report", "sdist". Please update your workflow to use v4 of the artifact actions. Learn more: https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

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