[release/3.1] Use googletest's new 'main' branch (#38412)

github-actions[bot] · dougbu · web-flow · commit a8cc5e4b3f80 · 2021-11-16T00:48:43.000Z
- backport of #38409 due to submodule conflicts that were fixed in #38410 Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com>
diff --git a/.gitmodules b/.gitmodules
@@ -1,7 +1,7 @@
 [submodule "src/submodules/googletest"]
 	path = src/submodules/googletest
 	url = https://github.com/google/googletest
-	branch = master
+	branch = main
 [submodule "src/submodules/MessagePack-CSharp"]
 	path = src/submodules/MessagePack-CSharp
 	url = https://github.com/aspnet/MessagePack-CSharp.git
diff --git a/src/submodules/googletest b/src/submodules/googletest
@@ -1 +1 @@
-Subproject commit 16f637fbf4ffc3f7a01fa4eceb7906634565242f
+Subproject commit 4848324c5ff3186a7f72a674f6760d0b8da585d7
