Pin Avro 1.12 in expansion service container

[Abacn]

Follow up #36092

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[Abacn]

Tested that ClassDefNotFoundError is gone in a managed transform pipeline. job id 2025-09-10_08_58_45-7916897436770286568. The pipeline now processing data normally

Update: ran a full compat test suites (managed IcebergIO/BigQueryIO/KafkaIO) and it passed

[github-actions]

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[Abacn]

R: @ahmedabu98 @chamikaramj

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[liferoad]

cc @Amar3tto

[Abacn]

opened cherry-pick #36113