Fix .gitmodules to use the correct absl branch

Author: deannagarcia

.gitmodules

@@ -5,7 +5,7 @@
 [submodule "third_party/abseil-cpp"]
 	path = third_party/abseil-cpp
 	url = https://github.com/abseil/abseil-cpp.git
-	branch = lts_2023_01_24
+	branch = lts_2023_01_25
 [submodule "third_party/jsoncpp"]
 	path = third_party/jsoncpp
 	url = https://github.com/open-source-parsers/jsoncpp.git