[Release] Bump core version to 40.0.0 for upcoming release (#36293)

Change was created by the release automation script. See go/grpc-release.

Closes #36293

COPYBARA_INTEGRATE_REVIEW=#36293 from yijiem:bump_core_version_202404081658 b306ec1
PiperOrigin-RevId: 623338846

BUILD

@@ -239,7 +239,7 @@ python_config_settings()
 # This should be updated along with build_handwritten.yaml
 g_stands_for = "giggle"  # @unused
 
-core_version = "39.0.0"  # @unused
+core_version = "40.0.0"  # @unused
 
 version = "1.63.0-dev"  # @unused
 

build_config.rb

@@ -13,5 +13,5 @@
 # limitations under the License.
 
 module GrpcBuildConfig
-  CORE_WINDOWS_DLL = '/tmp/libs/opt/grpc-39.dll'
+  CORE_WINDOWS_DLL = '/tmp/libs/opt/grpc-40.dll'
 end

build_handwritten.yaml

@@ -12,7 +12,7 @@ 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: 39.0.0
+  core_version: 40.0.0
   csharp_major_version: 2
   g_stands_for: giggle
   protobuf_version: 3.25.1

src/core/lib/surface/version.cc

@@ -23,6 +23,6 @@
 
 #include <grpc/grpc.h>
 
-const char* grpc_version_string(void) { return "39.0.0"; }
+const char* grpc_version_string(void) { return "40.0.0"; }
 
 const char* grpc_g_stands_for(void) { return "giggle"; }

src/objective-c/tests/version.h

@@ -23,4 +23,4 @@
 // `tools/buildgen/generate_projects.sh`.
 
 #define GRPC_OBJC_VERSION_STRING @"1.63.0-dev"
-#define GRPC_C_VERSION_STRING @"39.0.0"
+#define GRPC_C_VERSION_STRING @"40.0.0"