chore: update to rust 1.77 (microsoft#209563)

* chore: update to rust 1.77

* fix tests

Author: connor4312

build/azure-pipelines/cli/install-rust-posix.yml

@@ -1,7 +1,7 @@
 parameters:
   - name: channel
     type: string
-    default: 1.73.0
+    default: 1.77
   - name: targets
     default: []
     type: object

build/azure-pipelines/cli/install-rust-win32.yml

@@ -1,7 +1,7 @@
 parameters:
   - name: channel
     type: string
-    default: 1.73.0
+    default: 1.77
   - name: targets
     default: []
     type: object

cli/Cargo.lock

@@ -58,6 +58,7 @@ pub async fn acquire_singleton(lock_file: &Path) -> Result<SingletonConnection,
 		.read(true)
 		.write(true)
 		.create(true)
+		.truncate(false)
 		.open(lock_file)
 		.map_err(CodeError::SingletonLockfileOpenFailed)?;