fix: add missing dependencies to deptry ignore list

Add filetype, urllib3, pi-heif, and langchain-community to DEP002
ignore list with explanatory comments for why deptry can't detect
their usage patterns.

Author: skord

pyproject.toml

@@ -235,6 +235,10 @@ DEP002 = [
   "setuptools",  # Incorrectly used without declaring in some connectors (e.g. source-shopify)
   "cryptography",  # Constrained as transitive dependency due to a bug in newer versions
   "google-cloud-secret-manager",  # Deptry can't detect that `google.cloud.secretmanager_v1` uses this package
+  "filetype",  # Deptry can't detect usage via `unstructured.file_utils.filetype` imports
+  "urllib3",  # Used directly in comments/documentation, imported via requests
+  "pi-heif",  # Used by unstructured library for HEIF image processing
+  "langchain-community",  # Used by langchain extra but not directly imported
 
   # TODO: Remove these dependencies if not needed:
   "avro",  # Only imported in `unit_tests` code