chore: version bump to 3.4.0-rc (#16043)

Author: scotthart

CHANGELOG.md

@@ -7,6 +7,8 @@ breaking changes in the upcoming 4.x release. This release is scheduled for
 **NOTE**: Please refer to the [V3 Migration Guide](/doc/v3-migration-guide.md) 
 for details on updating existing applications using v1.x.y or v2.x.y.
 
+## v3.4.0 - TBD
+
 ## v3.3.0 - 2026-03
 
 ### New Libraries

CMakeLists.txt

@@ -21,9 +21,9 @@ set(PACKAGE_BUGREPORT "https://github.com/googleapis/google-cloud-cpp/issues")
 
 project(
     google-cloud-cpp
-    VERSION 3.3.0
+    VERSION 3.4.0
     LANGUAGES CXX)
-set(PROJECT_VERSION_PRE_RELEASE "")
+set(PROJECT_VERSION_PRE_RELEASE "rc")
 
 if (NOT "${PROJECT_VERSION_PRE_RELEASE}" STREQUAL "")
     set(PROJECT_VERSION "${PROJECT_VERSION}-${PROJECT_VERSION_PRE_RELEASE}")

MODULE.bazel

@@ -16,7 +16,7 @@
 
 module(
     name = "google_cloud_cpp",
-    version = "3.3.0",  # Updated by CMake
+    version = "3.4.0-rc",  # Updated by CMake
     compatibility_level = 3,  # Updated by CMake
 )