[rego-cpp] update to 1.5.2

[toge (toge)]

• 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, or no changes were necessary.
• Any fixed CI baseline and CI feature baseline entries are removed from that file, or no entries needed to be changed.
• All patch files in the port are applied and succeed.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Exactly one version is added in each modified versions file.

https://github.com/microsoft/rego-cpp/releases/tag/v1.5.2

[Billy O'Neal (BillyONeal)]

GPT 5.6 Sol reports:

• The package declares and installs only the upstream MIT license, but it compiles a copied base64 implementation carrying a separate zlib-style notice. Please declare the combined license and preserve that notice in the installed copyright. This is pre-existing in 1.4.1.
• The project always builds rego as a static library, even under dynamic-library triplets. Please make this explicit with vcpkg_check_linkage(ONLY_STATIC_LIBRARY). This is pre-existing.

Would you consider toge#35 ?