chore: scope syncEnvVars changeset to a build patch

Author: isshaddad

.changeset/sync-env-vars-is-secret.md

@@ -1,7 +1,5 @@
 ---
-"@trigger.dev/build": minor
-"@trigger.dev/core": minor
-"trigger.dev": minor
+"@trigger.dev/build": patch
 ---
 
 You can now mark environment variables synced via the `syncEnvVars` build extension as secrets. Return `{ name, value, isSecret: true }` from your callback and those variables are stored redacted in the dashboard, just like manually created secret env vars.