ci: fix failing MSRV uefi-raw job

The new uguid version bumps the MSRV to 1.81 [0], but we don't want this yet.

[0] google/gpt-disk-rs@02d38c2#r156105330

Author: phip1611

Cargo.lock

@@ -23,7 +23,8 @@ rust-version = "1.81"
 bitflags = "2.0.0"
 log = { version = "0.4.5", default-features = false }
 ptr_meta = { version = "0.3.0", default-features = false, features = ["derive"] }
-uguid = "2.1.0"
+# Pinned to keep uefi-raw's MSRV.
+uguid = "=2.2.0"
 
 [patch.crates-io]
 uefi = { path = "uefi" }