Rust Dependency: Bump boot_services from v1.1.0 to v1.2.0

Bumps [boot_services](https://github.com/microsoft/mu_rust_helpers) from v1.1.0 to v1.2.0.
- [Release notes](https://github.com/microsoft/mu_rust_helpers/releases)
- [Commits](microsoft/mu_rust_helpers@v1.1.0...b873b31)

---
updated-dependencies:
- dependency-name: boot_services
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -18,7 +18,7 @@ HidIo = {path = "HidPkg/Crates/HidIo"}
 hidparser = {git = "https://github.com/microsoft/mu_rust_hid.git", branch = "main"}
 HiiKeyboardLayout = {path = "HidPkg/Crates/HiiKeyboardLayout"}
 mu_rust_helpers = { git = "https://github.com/microsoft/mu_rust_helpers.git", tag = "v1.1.0" }
-boot_services = { git = "https://github.com/microsoft/mu_rust_helpers.git", tag = "v1.1.0" }
+boot_services = { git = "https://github.com/microsoft/mu_rust_helpers.git", tag = "v1.2.0" }
 
 memoffset = "0.9.0"
 num-traits = { version = "0.2", default-features = false}