Fix flake8 ISC004 violations.

[hjoliver]

New flake8 fails have appeared.

https://github.com/flake8-implicit-str-concat/flake8-implicit-str-concat/releases/tag/0.7.0

Add ISC004: unparenthesized implicit string concatenation in collection

ISC004

Checks for implicitly concatenated strings inside list, tuple, and set literals.

In collection literals, implicit string concatenation is often the result of a missing comma between elements, which can silently merge items together.

If the concatenation is intentional, wrap it in parentheses to make it explicit

Check List

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Applied any dependency changes to both setup.cfg (and conda-environment.yml if present).
• Tests are included (or explain why tests are not needed).
• Changelog entry included if this is a change that can affect users
• Cylc-Doc pull request opened if required at cylc/cylc-doc/pull/XXXX.
• If this is a bug fix, PR should be raised against the relevant ?.?.x branch.

[hjoliver]

Yikes, the ISC004 advice (wrap intentional concatenations in parentheses) can only handle two-line concatenations.

flake8-implicit-str-concat/flake8-implicit-str-concat#82

Hopefully I haven't just made an ass of myself 😁

[MetRonnie]

Might want to add this to setup.cfg to avoid the bug for the time being

flake8-implicit-str-concat>=0.4,!=0.7.0

[hjoliver]

Good to go now @MetRonnie

I guess when this gets merged, the auto sync PR will conflict with removal of setup.cfg on master and prompt us to update pyproject.toml ...