build(deps): DH-21987: upgrade Core cpp client deps (Arrow, gRPC, protobuf) on Windows

[jmao-denver]

The bulk of the changes are due to that gpr_log is deprecated because gRPC decided to go with Abseil logging in versions 1.65+.

[github-actions]

No docs changes detected for 5b55617

[Copilot]

Pull request overview

Updates the C++ client’s pinned vcpkg dependency set (Arrow / gRPC / Protobuf / Abseil) and makes small source changes needed to build cleanly with the newer dependency stack.

Changes:

• Bump vcpkg registry baseline and override versions for Arrow, gRPC, Protobuf, and Abseil.
• Replace gpr_log usage with Abseil logging (LOG / VLOG) across the C++ client.
• Add ElementRenderer support for char16_t / char32_t and apply Windows compile definitions (WIN32_LEAN_AND_MEAN, NOMINMAX).

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
cpp-client/deephaven/vcpkg.json	Updates dependency overrides to newer Arrow/gRPC/Protobuf/Abseil versions.
cpp-client/deephaven/vcpkg-configuration.json	Advances the vcpkg registry baseline commit.
cpp-client/deephaven/dhcore/include/public/deephaven/dhcore/utility/utility.h	Adds rendering overloads for char16_t / char32_t to improve debug/stream output compatibility.
cpp-client/deephaven/dhclient/src/utility/executor.cc	Migrates logging from gpr_log to Abseil LOG/VLOG.
cpp-client/deephaven/dhclient/src/subscription/subscribe_thread.cc	Migrates logging from gpr_log to Abseil LOG.
cpp-client/deephaven/dhclient/src/server/server.cc	Migrates logging from gpr_log to Abseil LOG/VLOG.
cpp-client/deephaven/dhclient/src/impl/table_handle_manager_impl.cc	Migrates logging from gpr_log to Abseil VLOG.
cpp-client/deephaven/dhclient/src/impl/table_handle_impl.cc	Migrates logging from gpr_log to Abseil LOG.
cpp-client/deephaven/dhclient/src/client.cc	Migrates logging from gpr_log to Abseil LOG.
cpp-client/deephaven/dhclient/include/private/deephaven/client/server/server.h	Removes now-unneeded grpc/support/log.h include.
cpp-client/deephaven/CMakeLists.txt	Adds Windows-wide compile definitions to reduce header pollution and macro conflicts.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[jcferretti]

We don't have CI to check that the iris dependencies (the C++ and R clients for Core+ in the enterprise repo) build and run correctly. We typically check that manually. I think we should do that.

[jcferretti]

I don't see any changes for base images. Is the the idea is that we are going to only upgrade the windows dependencies (via vcpg) and leave the rest (eg, linux) as is?

[jmao-denver]

I don't see any changes for base images. Is the the idea is that we are going to only upgrade the windows dependencies (via vcpg) and leave the rest (eg, linux) as is?

My wrong assumption was that the Linux build made use of vcpkg repo as well. After our call, I think the consensus is that we better separate the two efforts. https://deephaven.atlassian.net/browse/DH-22059 is created to address the upgrade on Linux which might involve migrating the build workflow to one that uses vcpkg.