Restore previously installed pnpm version (#35389)

tools/code-analyzer/src/lib/scan-changes.ts

@@ -70,6 +70,9 @@ export const scanForChanges = async (
 			);
 			const packageJSON = JSON.parse( fileStr );
 
+			// Temporarily save the current PNPM version.
+			await execAsync( `tmpgPNPM="$(pnpm --version)"` );
+
 			if ( packageJSON.engines && packageJSON.engines.pnpm ) {
 				await execAsync(
 					`npm i -g pnpm@${ packageJSON.engines.pnpm }`,
@@ -101,6 +104,9 @@ export const scanForChanges = async (
 
 		schemaChanges = schemaDiff || [];
 
+		// Restore the previously saved PNPM version
+		await execAsync( `npm i -g pnpm@"$tmpgPNPM"` );
+
 		Logger.endTask();
 	}