[DO-NOT-MERGE][test]: bump VPP fix submodules

Point the VPP combo test branch at the current sairedis and
sonic-platform-vpp fix branches so CI can build a validation image with the
fork-only commits.

Signed-off-by: Lun Yue <17232861+lunyue-ms@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lunyue-ms

.gitmodules

@@ -6,7 +6,7 @@
 	url = https://github.com/sonic-net/sonic-linux-kernel
 [submodule "sonic-sairedis"]
 	path = src/sonic-sairedis
-	url = https://github.com/sonic-net/sonic-sairedis
+	url = https://github.com/lunyue-ms/sonic-sairedis
 [submodule "sonic-swss"]
 	path = src/sonic-swss
 	url = https://github.com/sonic-net/sonic-swss
@@ -128,7 +128,7 @@
 	url = https://github.com/Marvell-switching/sonic-platform-marvell.git
 [submodule "platform/vpp"]
 	path = platform/vpp
-	url = https://github.com/sonic-net/sonic-platform-vpp.git
+	url = https://github.com/lunyue-ms/sonic-platform-vpp.git
 [submodule "platform/marvell-prestera/mrvl-prestera"]
 	path = platform/marvell-prestera/mrvl-prestera
 	url = https://github.com/Marvell-switching/mrvl-prestera.git