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Revert "lang/rust: Update to 1.63.0"

Description

Revert "lang/rust: Update to 1.63.0"

This reverts commit f36cc819accadae1fefc14c203e5fbe9c74e1492.

I asked for an exp-run for powerpc and powerpc64 on a recently provided
cluster machine but got no reply.

PR: 265915