Merge pull request #2078 from extrwi/submodule-update-return-type

Merge pull request #2078 from extrwi/submodule-update-return-type · gitpython-developers/GitPython@271328f

Original file line number	Diff line number	Diff line change
`@@ -520,7 +520,7 @@ def iter_submodules(self, args: Any, *kwargs: Any) -> Iterator[Submodule]:`
`520`	`520`	`"""`
`521`	`521`	`return RootModule(self).traverse(args, *kwargs)`
`522`	`522`
`523`		`-def submodule_update(self, args: Any, *kwargs: Any) -> Iterator[Submodule]:`
	`523`	`+def submodule_update(self, args: Any, *kwargs: Any) -> RootModule:`
`524`	`524`	`"""Update the submodules, keeping the repository consistent as it will`
`525`	`525`	`take the previous state into consideration.`
`526`	`526`