chore(ci): Bump slackapi/slack-github-action from 1 to 2

[dependabot]

Bumps slackapi/slack-github-action from 1 to 2.

Release notes

Sourced from slackapi/slack-github-action's releases.

Slack Send v2.0.0

YAML! And more API methods! With improved erroring! And more!

Sending data to Slack can now be done with the YAML format, and that data can be sent to [a Slack API method][methods] or technique of choice with the provided payload. And additional configurations can improve error handling or customize values between steps.

Breaking changes happen with this update and recommended migration strategies are detailed below. Adding this step to new workflows might prefer to follow the README instead 📚

What's changed

Both inputs of payload variables, techniques for sending the payload, additional configurations, and expected outputs were changed:

• Sending variables
  • Breaking changes
    • Only one payload input can be provided
    • Only one technique to send can be provided
    • Variable replacements no longer happen by default
    • Payload file path parsed option was removed
  • Enhancements
    • Payloads can now be written in YAML
    • Payload can now be written in unwrapped JSON
• Sending techniques
  • Technique 1: Slack Workflow Builder
    • Breaking changes
      • The webhook type must be specified in webhook inputs
      • Payload flattening no longer happens by default
    • Enhancements
      • The webhook URL can be specified in webhook inputs
  • Technique 2: Slack API method
    • Breaking changes
      • The Slack API method now must be specified in inputs
      • A token must be provided with other inputs
      • Inputs to the Slack API method must be provided in payloads
      • Messages cannot be sent to multiple channels in one step
  • Technique 3: Slack incoming webhook
    • Breaking changes
      • The webhook type must be specified for incoming webhooks
    • Enhancements
      • The webhook URL can be specified for incoming webhook
• Additional configurations
  • Enhancements
    • Steps can exit with an error after a failed Slack API call
    • Failed requests can be retried various amounts of times
    • Provided payloads can be flattened with a delimiter
    • Provided payloads can have templated variables replaced
    • Proxying HTTPS requests can be done within inputs
• Expected outputs
  • Breaking changes
    • The time value is now returned as the Unix epoch time
  • Enhancements
    • An ok value is added to represent response success

... (truncated)

Commits

• 91efab1 Release
• b6f4640 chore(release): tag version 2.1.1 (#474)
• d3dc61e build(deps-dev): bump @​biomejs/biome from 1.9.4 to 2.0.6 (#470)
• f647c89 build(deps-dev): bump @​types/node from 24.0.3 to 24.0.8 (#472)
• e6fa633 build(deps-dev): bump sinon from 20.0.0 to 21.0.0 (#471)
• 75b7822 build(deps-dev): bump mocha-suppress-logs from 0.5.1 to 0.6.0 (#469)
• d7b6150 build(deps-dev): bump mocha from 11.5.0 to 11.7.1 (#468)
• a7f5b68 build: clone repository "docs" and configuration when syncing project docs (#...
• c69deab build(deps-dev): bump @​types/node from 22.15.29 to 24.0.3 (#466)
• 1d0943c build(deps): bump axios from 1.9.0 to 1.10.0 (#465)
• Additional commits viewable in compare view

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