hooks: langchain: automatically raise recursion limit

Several tests on the CI are throwing recursion error with `langchain`
installed, so have the `langchain` hook automatically raise the
recursion limit to 5000 (unless it is already at higher value).

_pyinstaller_hooks_contrib/stdhooks/hook-langchain.py

@@ -10,6 +10,16 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 # ------------------------------------------------------------------
 
-from PyInstaller.utils.hooks import collect_data_files
+import sys
+
+from PyInstaller.utils.hooks import collect_data_files, logger
 
 datas = collect_data_files('langchain')
+
+# Automatically raise recursion limit to ensure it is at least 5000; this attempts to mitigate recursion limit errors
+# caused by some import chains that involve langchain, but also depend on the build environment (i.e., other packages
+# installed in it).
+new_limit = 5000
+if sys.getrecursionlimit() < new_limit:
+    logger.info("hook-langchain: raising recursion limit to %d", new_limit)
+    sys.setrecursionlimit(new_limit)