[Bug 280741] devel/grpc: fix build with clang 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280741

            Bug ID: 280741
           Summary: devel/grpc: fix build with clang 19
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(sunpoet@FreeBSD.org)
          Assignee: sunpoet@FreeBSD.org

Clang 19 now implements CWG 96 [1], which requires a template argument
list after a 'template' keyword, resulting in errors similar to:

   
/wrkdirs/usr/ports/devel/grpc/work/grpc-1.62.2/src/core/lib/promise/detail/basic_seq.h:103:38:
error: a template argument list is expected after a name prefixed by the
template keyword [-Wmissing-template-arg-list-after-template-kw]
      103 |                     Traits::template CallSeqFactory(f_, *cur_,
std::move(arg)));
          |                                      ^

In these cases, appending "<>" is enough to satisfy the constraint.
Upstream has committed a fix to their main branch [2], so pull this in
as a patch and apply it.

[1] https://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#96
[2]
https://github.com/grpc/grpc/commit/e55f69cedd0ef7344e0bcb64b5ec9205e6aa4f04

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