[202311] lock down submodule branches

Signed-off-by: Ying Xie <[email protected]>

.gitmodules

@@ -23,12 +23,15 @@
 [submodule "sonic-dbsyncd"]
 	path = src/sonic-dbsyncd
 	url = https://github.com/sonic-net/sonic-dbsyncd
+	branch = 202311
 [submodule "src/sonic-py-swsssdk"]
 	path = src/sonic-py-swsssdk
 	url = https://github.com/sonic-net/sonic-py-swsssdk.git
+	branch = 202311
 [submodule "src/sonic-snmpagent"]
 	path = src/sonic-snmpagent
 	url = https://github.com/sonic-net/sonic-snmpagent
+	branch = 202311
 [submodule "src/ptf"]
 	path = src/ptf
 	url = https://github.com/p4lang/ptf.git
@@ -81,7 +84,7 @@
 [submodule "src/sonic-restapi"]
 	path = src/sonic-restapi
 	url = https://github.com/sonic-net/sonic-restapi.git
-	branch = master
+	branch = 202311
 [submodule "src/sonic-mgmt-common"]
 	path = src/sonic-mgmt-common
 	url = https://github.com/sonic-net/sonic-mgmt-common.git
@@ -98,6 +101,7 @@
 [submodule "src/linkmgrd"]
 	path = src/linkmgrd
 	url = https://github.com/sonic-net/sonic-linkmgrd.git
+	branch = 202311
 [submodule "src/sonic-p4rt/sonic-pins"]
 	path = src/sonic-p4rt/sonic-pins
 	url = https://github.com/sonic-net/sonic-pins.git
@@ -107,22 +111,26 @@
 [submodule "src/dhcprelay"]
 	path = src/dhcprelay
 	url = https://github.com/sonic-net/sonic-dhcp-relay.git
+	branch = 202311
 [submodule "src/sonic-host-services"]
 	path = src/sonic-host-services
 	url = https://github.com/sonic-net/sonic-host-services
 	branch = 202311
 [submodule "src/sonic-gnmi"]
 	path = src/sonic-gnmi
 	url = https://github.com/sonic-net/sonic-gnmi.git
+	branch = 202311
 [submodule "src/sonic-genl-packet"]
 	path = src/sonic-genl-packet
 	url = https://github.com/sonic-net/sonic-genl-packet
 [submodule "src/dhcpmon"]
 	path = src/dhcpmon
 	url = https://github.com/sonic-net/sonic-dhcpmon.git
+	branch = 202311
 [submodule "src/sonic-dash-api"]
 	path = src/sonic-dash-api
 	url = https://github.com/sonic-net/sonic-dash-api.git
+	branch = 202311
 [submodule "platform/marvell-arm64/mrvl-prestera"]
 	path = platform/marvell-arm64/mrvl-prestera
 	url = https://github.com/Marvell-switching/mrvl-prestera.git