Rollup merge of #137169 - ojeda:rfl, r=lqd

CI: rfl: move job forward to Linux v6.14-rc3

Linux v6.14-rc3 contains commit 6273a058383e ("x86: rust: set rustc-abi=x86-softfloat on rustc>=1.86.0"), which resolves the error from rust-lang/rust#136146.

r? `@lqd` `@Kobzol`
try-job: x86_64-rust-for-linux
`@rustbot` label A-rust-for-linux
`@bors` try