remove the use of fn update_submodule on rust-analyzer

We don't need to run `fn update_submodule` on rust-analyzer
as it's no longer a submodule.

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/builder/tests.rs

@@ -22,7 +22,6 @@ fn configure_with_args(cmd: &[String], host: &[&str], target: &[&str]) -> Config
         ..Config::parse(&["check".to_owned()])
     });
     submodule_build.update_submodule(Path::new("src/doc/book"));
-    submodule_build.update_submodule(Path::new("src/tools/rust-analyzer"));
     config.submodules = Some(false);
 
     config.ninja_in_file = false;

src/bootstrap/dist.rs

@@ -1009,7 +1009,6 @@ impl Step for PlainSourceTarball {
             if builder.rust_info().is_managed_git_subrepository() {
                 // Ensure we have the submodules checked out.
                 builder.update_submodule(Path::new("src/tools/cargo"));
-                builder.update_submodule(Path::new("src/tools/rust-analyzer"));
             }
 
             // Vendor all Cargo dependencies