docs: update chlog after 2.1.4

[Borda]

What does this PR do?

standard update

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📚 Documentation preview 📚: https://pytorch-lightning--19420.org.readthedocs.build/en/19420/

[github-actions]

⚡ Required checks status: All passing 🟢

No groups match the files changed in this PR.

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Thank you for your contribution! 💜

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