Update dependency slack-notifier to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
slack-notifier	'~> 1.5.1' -> '~> 2.4.0'

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Release Notes

stevenosloan/slack-notifier (slack-notifier)

v2.4.0

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• Make keyword argument usage compatible for ruby 3.x [@​walski #​123, @​yuuu #​119]

v2.3.2

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• Improve compatability with CommonMark spec for markdown link formatting [@​revolter #​91]

  Still not 100% compliant, but it is now much closer.

v2.3.1

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• use map to return the array of responses instead of payload in ping & post [@​yhatt #​88]

v2.3.0

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• feat: add channels middleware to split payloads to ping multiple channels [#​40]
• feat: support any middleware splittin payload into an array to allow multiple payloads from a single process.

v2.2.2

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• fix wrapping of attachments passed as a hash
• fix error in LinkFormatter if a text payload was nil [#​81]

v2.2.1

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• fix loading error caused by uninitialized constant [@​pocke #​78]

v2.1.0

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• addition of :at middleware to simplify notifying users & rooms [@​kazuooooo #​66]

v2.0.0

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[BREAKING] This is a fairly large change to how defaults are set and how messages are processed.

Setting Defaults

Setter methods are no longer available for setting defaults on a notifier instance, you'll now set defaults with a block on initialization.

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