fix --dry-run when the change-id warning is printed

Author: jyn514

src/bootstrap/src/bin/main.rs

@@ -143,7 +143,7 @@ fn check_version(config: &Config) -> Option<String> {
                 "update `config.toml` to use `change-id = {latest_change_id}` instead"
             ));
 
-            if io::stdout().is_terminal() {
+            if io::stdout().is_terminal() && !config.dry_run() {
                 t!(fs::write(warned_id_path, latest_change_id.to_string()));
             }
         }

src/bootstrap/src/core/config/config.rs

@@ -1741,7 +1741,7 @@ impl Config {
         config
     }
 
-    pub(crate) fn dry_run(&self) -> bool {
+    pub fn dry_run(&self) -> bool {
         match self.dry_run {
             DryRun::Disabled => false,
             DryRun::SelfCheck | DryRun::UserSelected => true,