dependabot's tracking for 'gitmodules' is failing (#1589)

* modify .gitmodules

* modify .gitmodules

* change .gitmodules

.gitmodules

@@ -4,7 +4,6 @@
 [submodule "external/ubpf"]
 	path = external/ubpf
 	url = https://github.com/iovisor/ubpf.git
-	branch = master
 [submodule "external/bpftool"]
 	path = external/bpftool
 	url = https://github.com/dthaler/bpftool-1.git
@@ -12,7 +11,6 @@
 [submodule "external/win-c"]
 	path = external/win-c
 	url = https://github.com/takamin/win-c.git
-	branch = windows
 [submodule "external/Catch2"]
 	path = external/Catch2
 	url = https://github.com/catchorg/Catch2.git