Point submodules to the main branch

Also update submodule hashes to point to the main branch of the submodules.

Pull Request: https://projects.blender.org/blender/blender/pulls/118612

.gitmodules

@@ -2,28 +2,28 @@
 	update = none
 	path = lib/linux_x64
 	url = https://projects.blender.org/blender/lib-linux_x64.git
-	branch = blender-v4.1-release
+	branch = main
 [submodule "lib/macos_arm64"]
 	update = none
 	path = lib/macos_arm64
 	url = https://projects.blender.org/blender/lib-macos_arm64.git
-	branch = blender-v4.1-release
+	branch = main
 [submodule "lib/macos_x64"]
 	update = none
 	path = lib/macos_x64
 	url = https://projects.blender.org/blender/lib-macos_x64.git
-	branch = blender-v4.1-release
+	branch = main
 [submodule "lib/windows_x64"]
 	update = none
 	path = lib/windows_x64
 	url = https://projects.blender.org/blender/lib-windows_x64.git
-	branch = blender-v4.1-release
+	branch = main
 [submodule "release/datafiles/assets"]
 	path = release/datafiles/assets
 	url = https://projects.blender.org/blender/blender-assets.git
-	branch = blender-v4.1-release
+	branch = main
 [submodule "tests/data"]
 	update = none
 	path = tests/data
 	url = https://projects.blender.org/blender/blender-test-data.git
-	branch = blender-v4.1-release
+	branch = main