[vcpkg] Nix-shell package pkgconfig reanamed to pkg-config

[JonLiu1993]

Fixes #41986
Rename pkgconfig to pkg-config fix error:

nix-shell
error:
       … while calling the 'derivationStrict' builtin

         at /builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'vcpkg-shell-env'
         whose name attribute is located at /nix/store/dhsv8dalz1nm031xd6l8i085cmd0sv7q-nixpkgs/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:336:7

       … while evaluating attribute 'shellHook' of derivation 'vcpkg-shell-env'

         at /nix/store/dhsv8dalz1nm031xd6l8i085cmd0sv7q-nixpkgs/nixpkgs/pkgs/build-support/build-fhsenv-bubblewrap/default.nix:279:7:

          278|     env = runCommandLocal "${name}-shell-env" {
          279|       shellHook = bwrapCmd {};
             |       ^
          280|     } ''

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: 'pkgconfig' has been renamed to/replaced by 'pkg-config'

• Changes comply with the maintainer guide.
• SHA512s are updated for each updated download.
• The "supports" clause reflects platforms that may be fixed by this new version.
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.