WIP: pin x/tx version

[kocubinski]

Description

Checking CI

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[julienrbrt]

Oh that's problematic, we need to downgrade x/tx to go 1.21 in #22281 then (and in CI too)

[julienrbrt]

As discussed, we won't do it because of api in x/tx, we'll keep a version of x/tx specific to 0.50 until 0.50 is dropped.