[secp256k1] Actually use debian 12 on CI
Summary: The diff D18159 was missing the source container update.
Test Plan: Trivial
Reviewers: #bitcoin_abc, PiRK
Reviewed By: #bitcoin_abc, PiRK
Differential Revision: https://reviews.bitcoinabc.org/D18162
[secp256k1] Actually use debian 12 on CI Tags None Subscribers None
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