ci: Bump version to 2024-02-08 (the same commit with 1.78) (#15455)

Signed-off-by: Xuanwo <github@xuanwo.io>

Author: Xuanwo

scripts/setup/rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-01-23"
+channel = "nightly-2024-02-08"
 components = ["rustfmt", "clippy", "rust-src", "miri", "rust-analyzer"]