Upgrade lute to the latest version (#9880)

* Upgrade lute to the latest version

* store plaintext response

* fix conditional

Author: Nicell

frameworks/Luau/lute/lute.dockerfile

@@ -16,4 +16,4 @@ RUN rokit install --no-trust-check
 
 COPY ./src .
 
-CMD ["sh", "-c", "lute parallel.luau -- $(nproc)"]
+CMD ["sh", "-c", "lute parallel.luau"]

frameworks/Luau/lute/rokit.toml

@@ -4,4 +4,4 @@
 # New tools can be added by running `rokit add <tool>` in a terminal.
 
 [tools]
-lute = "aatxe/[email protected].20250322"
+lute = "luau-lang/[email protected].20250506"