CI: Don't skip workflow runs for Dependabot

The GHA workflows inherited by langchain-postgres invoke linters and
software tests only when needed, based on a diff of the source tree,
detecting if something has changed.

By extending the list of files of interest to include Python project
metadata files `pyproject.toml` and `poetry.lock`, this change ensures
that dependency updates submitted by Dependabot will also invoke the
software tests on CI.

.github/scripts/check_diff.py

@@ -20,6 +20,8 @@
         if any(
             file.startswith(dir_)
             for dir_ in (
+                "pyproject.toml",
+                "poetry.lock",
                 ".github/workflows",
                 ".github/tools",
                 ".github/actions",
@@ -28,6 +30,7 @@
         ):
             # add all LIB_DIRS for infra changes
             dirs_to_run["test"].update(LIB_DIRS)
+            dirs_to_run["lint"].update(LIB_DIRS)
 
         if any(file.startswith(dir_) for dir_ in LIB_DIRS):
             for dir_ in LIB_DIRS: