Prepare release: 1.0.3

[github-actions]

⚡ Merging this PR will automatically create a GitHub Release & publish the package ⚡

This PR was created by the Release stage 1 - create release PR workflow, triggered by @hjoliver

Tests:

• Tests last run on master:
• ✔️ Build check passed - see the workflow run (number 25) for more info

Checklist:

• Milestone complete?
  ⚠️ Couldn't find milestone matching 1.0.3
• Changelog up-to-date?
  • Examine pull requests made since the last release
  • "Released on" date updated? ✔️ 2022-05-19

Next steps:

• @hjoliver should request 1 or 2 reviews
• If any further changes are needed, push to this PR branch
• After merging, the bot will comment below with a link to the release (if not, look at the PR checks tab)

[hjoliver]

Tweak versions (to disallow dev extensions for the release) or not?

    metomi-rose==2.0rc3.*  # the .* permits dev versions
    cylc-flow==8.0rc3.*  # the .* permits dev versions

[MetRonnie]

Tweak versions (to disallow dev extensions for the release) or not?

Not sure if this was answered on Element, the answer is leave them as is

[github-actions]

✔️ success

Next steps for @hjoliver:

• view/edit the GitHub release description as appropriate
• ✔️ Milestone automatically closed

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Comment created by workflow: Release stage 2 - auto publish, run: 16