Bump versions and fix yarn installation in CI

[fcollonval]

PRs included in the coming release:

• Accept individual modifier keys as valid keybindings by @g547315 in Accept individual modifier keys as valid keybindings #637
• Datagrid: Add a public API to get the current viewport by @martinRenou in Datagrid: Add a public API to get the current viewport #695
• Support host and ref options in Menu.open by @ianthomas23 in Support host and ref options in Menu.open #700
• Extract plugin handling in a PluginRegistry class independent of the Application by @fcollonval in Extract plugin handling in a PluginRegistry class independent of the Application #703
• Interleaves search results across categories by @JasonWeill in Interleaves search results across categories #706

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• Align typedoc config with JupyterLab by @fcollonval in Align typedoc config with JupyterLab #696
• Switch from karma to web-test-runner by @fcollonval in Switch from karma to web-test-runner #704
• Don't bail early when running all tests by @fcollonval in Don't bail early when running all tests #707

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• Bump the actions group with 1 update by @dependabot in Bump the actions group with 1 update #694
• Bump ejs from 3.1.8 to 3.1.10 by @dependabot in Bump ejs from 3.1.8 to 3.1.10 #702
• Bump the actions group with 2 updates by @dependabot in Bump the actions group with 2 updates #701
• Bump tj-actions/changed-files from 44.3.0 to 44.5.2 in the actions group by @dependabot in Bump tj-actions/changed-files from 44.3.0 to 44.5.2 in the actions group #708
• Bump braces from 3.0.2 to 3.0.3 by @dependabot in Bump braces from 3.0.2 to 3.0.3 #710

[fcollonval]

Note: all packages have been bumped because of the changes of the test runner and the typedoc configuration => lerna list the packages has modified.