Add Slack channel name to actions description

[i5o]

Describe your changes

• Added Slack channel name to the actions description of the issue, sometimes in mobile the Join button doesn't work. Having it directly linked it's an additional approach that fixes this.

Issue number and link

Checklist before requesting a review

• [x] I have properly bumped all version refs by running ./scripts/version-bump.sh v<new> from project root - for example ./scripts/version-bump.sh v1.9.3