Add test case that exercises py312 syntax

Author: maffoo

gazelle/python/testdata/py312_syntax/BUILD.in

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+# gazelle:python_generation_mode file

gazelle/python/testdata/py312_syntax/BUILD.out

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+load("@rules_python//python:defs.bzl", "py_binary", "py_library")
+
+# gazelle:python_generation_mode file
+
+py_library(
+    name = "_other_module",
+    srcs = ["_other_module.py"],
+    visibility = ["//:__subpackages__"],
+)
+
+py_binary(
+    name = "pep_695_type_parameter",
+    srcs = ["pep_695_type_parameter.py"],
+    visibility = ["//:__subpackages__"],
+    deps = [":_other_module"],
+)

gazelle/python/testdata/py312_syntax/README.md

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+# py312 syntax
+
+This test case checks that we properly parse certain python 3.12 syntax, such
+as pep 695 type parameters, with go-tree-sitter.

gazelle/python/testdata/py312_syntax/WORKSPACE

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+# This is a Bazel workspace for the Gazelle test data.

gazelle/python/testdata/py312_syntax/__init__.py

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+def search_one_more_level[T](
+    graph: dict[T, set[T]], seen: set[T], routes: list[list[T]], target: T
+) -> list[T] | None:
+    """This function fails to parse with older versions of go-tree-sitter.
+
+    Args:
+        graph: The graph to search as input.
+        seen: The nodes that have been visited as input/output.
+        routes: The current routes in the breadth-first search as input/output.
+        target: The target to search in this extra search level.
+
+    Returns:
+        a route if it ends on the target, or None if no route reaches the
+        target.
+    """
+
+
+import _other_module
+
+
+if __name__ == "__main__":
+    pass

gazelle/python/testdata/py312_syntax/_other_module.py

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+---