feat: update vcpkg and deps to around 2023-03-02

[zao]

This updates the following direct dependencies:

• curl 8.2.1 -> 8.6.0
• fmt 10.1.1 -> 10.2.1
• giflib 5.2.1 -> removed
• glfw3 3.3.8 -> 3.4
• libjpeg-turbo 3.0.0 -> removed
• liblzma 5.4.3 -> removed
• libpng 1.6.39 -> removed
• libsodium 1.0.18 -> removed
• zlib 1.3 -> 1.3.1

We cannot track anything newer at the moment as the next commit makes pkg-config run out of resources while validating Abseil packaging. See https://github.com/microsoft/vcpkg/issues/37213 for more information.

libsodium replaced with a vendored and modified copy of curl's curl_base64.h and base64.c.