net-im/slack: Bump to 4.19.2

[dawn-minion]

Release notes are:

This release includes significant security improvements. Updating is strongly recommended.

Adds new ebuild for 4.19.2, and drops old ones up to 4.18.0.

[gentoo-bot]

Pull Request assignment

Submitter: @dawn-minion
Areas affected: ebuilds
Packages affected: net-im/slack

net-im/slack: @SpiderX, @gentoo/proxy-maint

Linked bugs

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If you do not receive any reply to this pull request, please open or link a bug to attract the attention of maintainers.

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Docs: Code of Conduct ● Copyright policy (expl.) ● Devmanual ● GitHub PRs ● Proxy-maint guide

[gentoo-repo-qa-bot]

Pull request CI report

Report generated at: 2021-08-24 14:10 UTC
Newest commit scanned: 5098603
Status: ✅ good

There are existing issues already. Please look into the report to make sure none of them affect the packages in question:
https://qa-reports.gentoo.org/output/gentoo-ci/aed4b3f8db/output.html

[thesamesam]

If possible, in future, would you be able to cleanup in a separate commit? Anyway, thank you!

[dawn-minion]

@thesamesam Noted, will do! Thanks for merging.