[jssrc2cpg] Bump astgen 3.34.0 -> 3.41.0

[max-leuthaeuser]

Key canges in astgen since 3.34.0:

• 3.36.0: Add readable check to src dir
• 3.38.0: Add add guard for large/generated files (size >5MB, >50K lines, >10K byte lines), and prevent OOM on emscripten checks
• 3.39.0: Fix OOM on large JS/TS projects: remove NoTruncation type flag, add MAX_TYPE_STRING_LENGTH guard, skip type resolution for keyword/punctuation nodes
• 3.40.0: Reduce memory pressure and redundant I/O for large projects: merge file content checks into single pass, stream AST serialization in 64KB chunks, stream typemap serialization directly from Map entries
• 3.41.0: More performance fixes:
  • pack (start,end) into a single number key for TypeMap instead of allocating a "start:end" string per node (~4x smaller keys)
  • use readdirp entry.stats to avoid redundant statSync; read files actually only exactly once
  • deduplicate mkdirSync calls per output directory