Update slixmpp to 1.8.2

[michaeldavie]

Proposed change

This updates corrects an issue introduced in #68080, which was caused by slixmpp introducing defusedxml in 1.8.0. This change caused a conflict with the environment_canada integration when the xmpp component was used.

slixmpp release details for 1.8.1 and 1.8.2: https://lab.louiz.org/poezio/slixmpp/-/releases

Big thanks to @gwww, @kwkid, and @mcfarlde for investigating!

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Environment Canada: Unexpected error fetching environment_canada radar data #69047
• This PR is related to issue:
• Link to documentation pull request:

Checklist

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[probot-home-assistant]

Hey there @fabaff, @flowolf, mind taking a look at this pull request as it has been labeled with an integration (xmpp) you are listed as a code owner for? Thanks!
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