Fixes#38582. PR https://github.com/h4tr3d/avcpp/pull/137 submitted to
upstream has been merged, and a new version has been released by
upstream, so updating to 2.4.0 fixes the issue:
```
1> [CMake] CMake Error at build/debug/vcpkg_installed/x64-windows/share/avcpp/avcpp-targets.cmake:61 (set_target_properties):
1> [CMake] The link interface of target "avcpp::avcpp" contains:
1> [CMake]
1> [CMake] Threads::Threads
1> [CMake]
1> [CMake] but the target was not found. Possible reasons include:
1> [CMake]
1> [CMake] * There is a typo in the target name.
1> [CMake] * A find_package call is missing for an IMPORTED target.
1> [CMake] * An ALIAS target is missing.
1> [CMake]
1> [CMake] Call Stack (most recent call first):
1> [CMake] build/debug/vcpkg_installed/x64-windows/share/avcpp/avcpp-config.cmake:26 (include)
1> [CMake] vcpkg/scripts/buildsystems/vcpkg.cmake:859 (_find_package)
1> [CMake] CMakeLists.txt:16 (find_package)
```
- [x] Changes comply with the [maintainer
guide](https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/contributing/maintainer-guide.md).
- [ ] ~SHA512s are updated for each updated download.~
- [ ] ~The "supports" clause reflects platforms that may be fixed by
this new version.~
- [ ] ~Any fixed [CI
baseline](https://github.com/microsoft/vcpkg/blob/master/scripts/ci.baseline.txt)
entries are removed from that file.~
- [ ] ~Any patches that are no longer applied are deleted from the
port's directory.~
- [x] The version database is fixed by rerunning `./vcpkg x-add-version
--all` and committing the result.
- [x] Only one version is added to each modified port's versions file.
---------
Co-authored-by: Monica <v-liumonica@microsoft.com>
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