Bump version to v1.33.x-pre1

BUILD

@@ -82,9 +82,9 @@ python_config_settings()
 # This should be updated along with build_handwritten.yaml
 g_stands_for = "geeky"
 
-core_version = "12.0.0"
+core_version = "13.0.0"
 
-version = "1.33.0-dev"
+version = "1.33.0-pre1"
 
 GPR_PUBLIC_HDRS = [
     "include/grpc/support/alloc.h",

build_handwritten.yaml

@@ -12,10 +12,10 @@ 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: 12.0.0
+  core_version: 13.0.0
   csharp_major_version: 2
   g_stands_for: geeky
-  version: 1.33.0-dev
+  version: 1.33.0-pre1
 targets:
 - name: check_epollexclusive
   build: tool

doc/g_stands_for.md

@@ -32,4 +32,4 @@
 - 1.30 'g' stands for ['gradius'](https://github.com/grpc/grpc/tree/v1.30.x)
 - 1.31 'g' stands for ['galore'](https://github.com/grpc/grpc/tree/v1.31.x)
 - 1.32 'g' stands for ['giggle'](https://github.com/grpc/grpc/tree/v1.32.x)
-- 1.33 'g' stands for ['geeky'](https://github.com/grpc/grpc/tree/master)
+- 1.33 'g' stands for ['geeky'](https://github.com/grpc/grpc/tree/v1.33.x)