Merge pull request #21764 from lidizheng/patch-time-out-1.27

[v1.27.x Patch] Double the time limit for linux extra artifacts build

tools/internal_ci/linux/grpc_build_artifacts_extra.cfg

@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/linux/grpc_build_artifacts_extra.sh"
-timeout_mins: 240
+timeout_mins: 480
 action {
   define_artifacts {
     regex: "**/*sponge_log.*"

tools/internal_ci/linux/grpc_build_artifacts_extra_release.cfg

@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/linux/grpc_build_artifacts_extra.sh"
-timeout_mins: 240
+timeout_mins: 480
 action {
   define_artifacts {
     regex: "**/*sponge_log.*"