Bump Tibber library to 0.21.0

[Danielhiversen]

Signed-off-by: Daniel Hjelseth Høyer github@dahoiv.net

Breaking change

Proposed change

Bump Tibber library
Danielhiversen/pyTibber@0.19.1...0.21.0
Mainly to "Remove deprecated async-timeout synchronous context manager usage"

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• Dependency upgrade
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[frenck]

Thanks, @Danielhiversen 👍