libraries/grpc: Remove trailing space within SlackBuild

[isaackwy]

I was attempting to update grpc to 1.68.0, but I failed to do so. Some sample output below:

CMake Error at CMakeLists.txt:611 (file):
  file COPY cannot find
  "/tmp/SBo/grpc-1.68.0/third_party/envoy-api/envoy/annotations/deprecation.proto":
  No such file or directory.
Call Stack (most recent call first):
  CMakeLists.txt:893 (protobuf_generate_grpc_cpp_with_import_path_correction)

This means I will also not update python3-grpcio to 1.68.0 (both python3-grpcio and grpc should be at the same version).

Meanwhile, I found out this trailing space within the grpc SlackBuild.

[github-actions]

reverse dependencies - libraries/grpc

• development/Bear
• system/sysdig

[github-actions]

✅ sbolint - libraries/grpc ✅

sbolint: grpc checks out OK

[willysr]

merged