CI: Set ssh-action specific version to workaround issue in main branch.

Bump version to 1.2.0 (with the inclusion of Snek, the minor bump was…

… suggested, rather than point release).

Bump version of Flask.

Bump to beta 7, add changelog.

Merge pull request #1844 from mu-editor/ipython_genutils

Depend on `ipython_genutils` to fix issue with missing `ipykernel` dependency

Final update to CHANGES

Changelog and version bump for beta-4.

Update CHANGES to reflect new status of space-in-path issue.

Changes and Readme updates for 1.1.0-beta.1

Update version number, copyright year in docs and changelog for new r…

…elease.