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Rollup merge of #140470 - ojeda:rfl, r=lqd
CI: rfl: move job forward to Linux v6.15-rc4
A hopefully routine upgrade to Linux v6.15-rc4!
r? `````@lqd````` `````@Kobzol`````
try-job: x86_64-rust-for-linux
`````@rustbot````` label A-rust-for-linux
`````@bors````` try
