PocoFoundationConfig.cmake is missing Utf8Proc dependency

[atsampson]

Describe the bug
Poco 1.14.0 introduced a dependency on Utf8Proc. However, PocoFoundationConfig.cmake doesn't have a find_dependency call for it.

To Reproduce
Install Poco 1.14.0 with -DPOCO_UNBUNDLED on Linux. Attempt to configure Mumble 1.5.634 against it (Mumble's CMake build system doesn't look for Utf8Proc itself). CMake fails, with the error:

  The link interface of target "Poco::Foundation" contains:
                                  
    Utf8Proc::Utf8Proc

  but the target was not found.  [...]

Expected behavior
Configuration completes as with previous versions of Poco (although I expect Mumble will need other fixes too).

Please add relevant environment information:

• Linux (GARStow)
• POCO 1.14.0
• CMake 3.31.1

Additional context
I've fixed this locally by adding cmake/FindUtf8Proc.cmake to the installation of FindPCRE2.cmake in CMakeLists.txt, and adding find_dependency(Utf8Proc REQUIRED) to cmake/PocoFoundationConfig.cmake; I'm not sure if that's the right fix, but it's consistent with how the other dependencies are handled.