[abseil] Fix CMake warning

[Dico200]

Describe the pull request

• What does your PR fix?
  It applies the same fix as this abseil commit
  This warning:

CMake Warning (dev) at C:/Users/Dico/AppData/Local/JetBrains/Toolbox/apps/CLion/ch-0/202.6397.106/bin/cmake/win/share/cmake-3.17/Modules/FindPackageHandleStandardArgs.cmake:272 (message):
  The package name passed to `find_package_handle_standard_args` (Threads)
  does not match the name of the calling package (absl).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  C:/Users/Dico/AppData/Local/JetBrains/Toolbox/apps/CLion/ch-0/202.6397.106/bin/cmake/win/share/cmake-3.17/Modules/FindThreads.cmake:234 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  C:/repos/vcpkg/installed/x64-windows-static-md/share/absl/abslConfig.cmake:3 (include)
  C:/repos/vcpkg/scripts/buildsystems/vcpkg.cmake:439 (_find_package)
  C:/repos/vcpkg/installed/x64-windows-static-md/share/gRPC/gRPCConfig.cmake:18 (find_package)
  C:/repos/vcpkg/scripts/buildsystems/vcpkg.cmake:437 (_find_package)
  CMakeLists.txt:27 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

• Which triplets are supported/not supported? Have you updated the CI baseline?
  N/A

• Does your PR follow the maintainer guide?
  I read through the guide, I think so, except that there is no CONTROL file in this port (I bumped the version in vcpkg.json)

[ghost]

All CLA requirements met.

[Dico200]

I ran the command to format the manifest file - vcpkg x-format-manifest --all, it did not make any changes. I also did not change any formatting in the vcpkg.json file.

[NancyLi1013]

Hi @Dico200
Thanks for this PR.

have you tested the feature cxx17?

[NancyLi1013]

Feature cxx17 has passed with the following triplets:

• x86-windows
• x64-windows
• x64-windows-static

[Dico200]

Hi @NancyLi1013 , it's a small effort :) thanks for the review!
I just tested the [cxx17] feature with success as well for x86-windows, x64-windows-static and even x64-windows-static-md.