fix(dbt): support MultiPartitionMapping (#23363)

fix build_dbt_multi_asset_args to accept MultiParitionMapping:
- deps var was defined as a set, and was throwing an error when trying
to insert an AssetDep with a MultiPartitionMapping
- MultiPartitionMapping is taking in a dict, making it unhashable
Error I was getting
```
File "/Users/username/dev/data_orchestrations/project/internals/assets/dbt_assets.py", line 21, in dbt_asset_factory
    @dbt_assets(
     ^^^^^^^^^^^
  File "/Users/username/dev/data_orchestrations/project/.venv/lib/python3.12/site-packages/dagster/_core/decorator_utils.py", line 223, in wrapped_with_context_manager_fn
    return fn(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^
  File "/Users/username/dev/data_orchestrations/project/.venv/lib/python3.12/site-packages/dagster_dbt/asset_decorator.py", line 311, in dbt_assets
    ) = build_dbt_multi_asset_args(
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/username/dev/data_orchestrations/project/.venv/lib/python3.12/site-packages/dagster_dbt/asset_utils.py", line 995, in build_dbt_multi_asset_args
    deps.add(
TypeError: unhashable type: 'dict'
```

## Summary & Motivation
I have flagged this issues while working on my own pipelines 

## How I Tested These Changes

Co-authored-by: Rex Ledesma <[email protected]>

python_modules/libraries/dagster-dbt/dagster_dbt/asset_utils.py

@@ -758,7 +758,7 @@ def build_dbt_multi_asset_args(
         asset_resource_types=ASSET_RESOURCE_TYPES,
     )
 
-    deps: Set[AssetDep] = set()
+    deps: Dict[AssetKey, AssetDep] = {}
     outs: Dict[str, AssetOut] = {}
     internal_asset_deps: Dict[str, Set[AssetKey]] = {}
     check_specs_by_key: Dict[AssetCheckKey, AssetCheckSpec] = {}
@@ -870,23 +870,19 @@ def build_dbt_multi_asset_args(
 
             # Mark this parent as an input if it has no dependencies
             if parent_unique_id not in dbt_unique_id_deps:
-                deps.add(
-                    AssetDep(
-                        asset=parent_asset_key,
-                        partition_mapping=parent_partition_mapping,
-                    )
+                deps[parent_asset_key] = AssetDep(
+                    asset=parent_asset_key,
+                    partition_mapping=parent_partition_mapping,
                 )
 
         self_partition_mapping = dagster_dbt_translator.get_partition_mapping(
             dbt_resource_props,
             dbt_parent_resource_props=dbt_resource_props,
         )
         if self_partition_mapping and has_self_dependency(dbt_resource_props):
-            deps.add(
-                AssetDep(
-                    asset=asset_key,
-                    partition_mapping=self_partition_mapping,
-                )
+            deps[asset_key] = AssetDep(
+                asset=asset_key,
+                partition_mapping=self_partition_mapping,
             )
             output_internal_deps.add(asset_key)
 
@@ -923,7 +919,7 @@ def build_dbt_multi_asset_args(
             "\n\n".join([DUPLICATE_ASSET_KEY_ERROR_MESSAGE, *error_messages])
         )
 
-    return list(deps), outs, internal_asset_deps, list(check_specs_by_key.values())
+    return list(deps.values()), outs, internal_asset_deps, list(check_specs_by_key.values())
 
 
 def get_asset_deps(

python_modules/libraries/dagster-dbt/dagster_dbt_tests/core/test_asset_decorator.py

@@ -12,14 +12,17 @@
     DailyPartitionsDefinition,
     Definitions,
     DependencyDefinition,
+    DimensionPartitionMapping,
     FreshnessPolicy,
     Jitter,
     LastPartitionMapping,
+    MultiPartitionMapping,
     NodeInvocation,
     OpDefinition,
     PartitionMapping,
     PartitionsDefinition,
     RetryPolicy,
+    StaticPartitionMapping,
     StaticPartitionsDefinition,
     TimeWindowPartitionMapping,
     asset,
@@ -467,6 +470,18 @@ def my_dbt_assets(): ...
         None,
         LastPartitionMapping(),
         TimeWindowPartitionMapping(start_offset=-1, end_offset=-1),
+        MultiPartitionMapping(
+            {
+                "abc": DimensionPartitionMapping(
+                    dimension_name="123",
+                    partition_mapping=StaticPartitionMapping({"a": "1", "b": "2", "c": "3"}),
+                ),
+                "weekly": DimensionPartitionMapping(
+                    dimension_name="daily",
+                    partition_mapping=TimeWindowPartitionMapping(),
+                ),
+            }
+        ),
     ],
 )
 def test_with_partition_mappings(