ci: update notify-slack-action to v1.1.0

[anakin87]

Related Issues

• CI errors due to bare version numbers (instead of SHA) used in GitHub actions: https://github.com/deepset-ai/haystack-core-integrations/actions/runs/26096501166/job/76735543315
  • this stems from bare slackapi/slack-github-action@v2 previously used in https://github.com/deepset-ai/notify-slack-action
  • I fixed this in deepset-ai/notify-slack-action@a65def0 and released a new version (v1.1.0) of the GitHub Action

Proposed Changes:

• adopt notify-slack-action v1.1.0

How did you test it?

Tested on the failing PR. 5104b4e -> workflow now runs correctly https://github.com/deepset-ai/haystack-core-integrations/actions/runs/26103230779/job/76759808783

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.

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