Update cryptopp.git to CRYPTOPP_8_8_0

[flathubbot]

🤖 This pull request was automatically generated by flathub/flatpak-external-data-checker. Please open an issue if you have any questions or complaints. 🤖

[flathubbot]

Started test build 49616

[flathubbot]

Build 49616 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/32219/nz.mega.MEGAsync.flatpakref

[flathubbot]

Started test build 49905

[flathubbot]

Build 49905 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/32516/nz.mega.MEGAsync.flatpakref