Bump v1.13.x to v1.13.0-pre2

BUILD

@@ -66,9 +66,9 @@ config_setting(
 # This should be updated along with build.yaml
 g_stands_for = "gloriosa"
 
-core_version = "6.0.0-pre1"
+core_version = "6.0.0-pre2"
 
-version = "1.13.0-pre1"
+version = "1.13.0-pre2"
 
 GPR_PUBLIC_HDRS = [
     "include/grpc/support/alloc.h",

build.yaml

@@ -12,9 +12,9 @@ settings:
   '#08': Use "-preN" suffixes to identify pre-release versions
   '#09': Per-language overrides are possible with (eg) ruby_version tag here
   '#10': See the expand_version.py for all the quirks here
-  core_version: 6.0.0-pre1
+  core_version: 6.0.0-pre2
   g_stands_for: gloriosa
-  version: 1.13.0-pre1
+  version: 1.13.0-pre2
 filegroups:
 - name: alts_proto
   headers: