Improve types in polyglot_piranha.pyi (#674)

polyglot_piranha.pyi

@@ -9,6 +9,7 @@
 # express or implied. See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import annotations
 from typing import List, Optional
 
 def execute_piranha(piranha_argument: PiranhaArguments) -> list[PiranhaOutputSummary]:
@@ -35,7 +36,7 @@ class PiranhaArguments:
         paths_to_codebase: Optional[List[str]] = None,
         include: Optional[List[str]] = None,
         exclude: Optional[List[str]] = None,
-        substitutions: Optional[dict] = None,
+        substitutions: Optional[dict[str, str]] = None,
         path_to_configurations: Optional[str] = None,
         rule_graph: Optional[RuleGraph] = None,
         code_snippet: Optional[str] = None,
@@ -141,7 +142,7 @@ class Match:
     range: Range
     "Range of the entire AST node captured by the match"
 
-    matches: dict
+    matches: dict[str, str]
     "The mapping between tags and string representation of the AST captured"
     ""
 
@@ -289,7 +290,7 @@ class RuleGraph:
     "The rules in the graph"
     edges: list[OutgoingEdges]
     "The edges in the graph"
-    graph: dict
+    graph: dict[str, list[tuple[str, str]]]
     "The graph itself (as an adjacency list)"
 
     def __init__(