core, dependencies: Update Tx-XMPP to 0.12:

Tx-XMPP 0.12 has beaking change in `discoFeature.identities` because it now supports
`xml:lang` attribute, so this update implies updating the code everywhere were this is
used.
This commit is contained in:
Goffi 2026-04-17 15:27:40 +02:00
commit f6db575ee4
10 changed files with 747 additions and 696 deletions

1275
uv.lock generated

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