chore: off-by-one directory error (#465)

Fixes #

---
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Author: rix0rrr

.projenrc.ts

@@ -812,7 +812,7 @@ const toolkitLib = configureProject(
         module: 'NodeNext',
       },
     },
-    nextVersionCommand: 'tsx ../../projenrc/next-version.ts maybeRc',
+    nextVersionCommand: 'tsx ../../../projenrc/next-version.ts maybeRc',
   }),
 );