Deal with Github Actions deprecation warnings #11
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https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/ says "stuff is deprecated and will be turned off at some point". No urgency as such, but without doing this we're going to get warning messages all over the place whenever we use this action.
See matrix-org/synapse#14203
TODO: