Fix E704 flake8 errors in overload stubs

Move ... to its own line in @overload function signatures.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jmchilton

gxformat2/to_format2.py

@@ -74,15 +74,17 @@ def to_format2(
     workflow: dict[str, Any] | str | Path | NativeGalaxyWorkflow | NormalizedNativeWorkflow,
     options: ConversionOptions,
     expand: Literal[True],
-) -> ExpandedFormat2: ...
+) -> ExpandedFormat2:
+    ...
 
 
 @overload
 def to_format2(
     workflow: dict[str, Any] | str | Path | NativeGalaxyWorkflow | NormalizedNativeWorkflow,
     options: ConversionOptions | None = None,
     expand: Literal[False] = False,
-) -> NormalizedFormat2: ...
+) -> NormalizedFormat2:
+    ...
 
 
 def to_format2(

gxformat2/to_native.py

@@ -97,15 +97,17 @@ def to_native(
     workflow: dict[str, Any] | str | Path | NormalizedFormat2 | GalaxyWorkflow,
     options: ConversionOptions,
     expand: Literal[True],
-) -> ExpandedNativeWorkflow: ...
+) -> ExpandedNativeWorkflow:
+    ...
 
 
 @overload
 def to_native(
     workflow: dict[str, Any] | str | Path | NormalizedFormat2 | GalaxyWorkflow,
     options: ConversionOptions | None = None,
     expand: Literal[False] = False,
-) -> NormalizedNativeWorkflow: ...
+) -> NormalizedNativeWorkflow:
+    ...
 
 
 def to_native(