build: bump the grpc-deps group across 1 directory with 3 updates

Bumps the grpc-deps group with 3 updates in the / directory: [grpcio](https://github.com/grpc/grpc), [grpcio-health-checking](https://grpc.io) and [protobuf](https://github.com/protocolbuffers/protobuf).


Updates `grpcio` from 1.67.1 to 1.68.1
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.67.1...v1.68.1)

Updates `grpcio-health-checking` from 1.67.1 to 1.68.1

Updates `protobuf` from 5.28.3 to 5.29.2
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v5.28.3...v5.29.2)

---
updated-dependencies:
- dependency-name: grpcio
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: grpc-deps
- dependency-name: grpcio-health-checking
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: grpc-deps
- dependency-name: protobuf
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: grpc-deps
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -54,11 +54,11 @@ tests = [
     "ansys-tools-visualization-interface==0.6.2",
     "beartype==0.19.0",
     "docker==7.1.0",
-    "grpcio==1.67.1",
-    "grpcio-health-checking==1.67.1",
+    "grpcio==1.68.1",
+    "grpcio-health-checking==1.68.1",
     "numpy==2.2.0",
     "Pint==0.24.4",
-    "protobuf==5.28.3",
+    "protobuf==5.29.2",
     "pytest==8.3.4",
     "pytest-cov==6.0.0",
     "pytest-pyvista==0.1.9",
@@ -82,8 +82,8 @@ doc = [
     "ansys-tools-visualization-interface==0.6.2",
     "beartype==0.19.0",
     "docker==7.1.0",
-    "grpcio==1.67.1",
-    "grpcio-health-checking==1.67.1",
+    "grpcio==1.68.1",
+    "grpcio-health-checking==1.68.1",
     "ipyvtklink==0.2.3",
     "jupyter_sphinx==0.5.3",
     "jupytext==1.16.6",
@@ -95,7 +95,7 @@ doc = [
     "numpy==2.2.0",
     "panel==1.5.5",
     "Pint==0.24.4",
-    "protobuf==5.28.3",
+    "protobuf==5.29.2",
     "pyvista[jupyter]==0.44.2",
     "requests==2.32.3",
     "scipy==1.14.1",