Update dependency isort to v5

This MR contains the following updates:

Package	Type	Update	Change
isort	dev-dependencies	major	^4.3.21 -> ^5.0.0

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This MR has been generated by Renovate Bot.

Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this MR as-is.

Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you check the rebase/retry checkbox if found above, or
• you rename this MR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: poetry.lock

Creating virtualenv aleksis-app-dashboardfeeds-NJz_phru-py3.8 in /home/ubuntu/.cache/pypoetry/virtualenvs
Updating dependencies
Resolving dependencies...

[ReadError]
file could not be opened successfully

MR has been edited

This MR has received other commits, so Renovate will stop updating it to avoid conflicts or other problems. If you wish to abandon your changes and have Renovate start over you may click the "rebase" checkbox in the MR body/description.

mentioned in commit ebf0038b

merged