build: fix build failure with cpp-httplib >= 0.23

[jengelh]

Pull Request Type

• GitHub Workflow changes
• Documentation or Wiki changes
• Build and Dependency changes

Description

httplib changed their API in 0.23 and D3 fails to build since.

Checklist

• I have tested my changes locally and verified that they work as intended. [linux only, no vcpkg]
• I have documented any new or modified functionality.
• I have reviewed the changes to ensure they do not introduce any unnecessary complexity or duplicate code.
• I understand that by submitting this pull request, I am agreeing to license my contributions under the project's license.

[winterheart]

Hi, sorry for delay.
Seems there need to update vcpkg baseline. Current don't have 0.23 version.

[winterheart]

OK, finally all green, ready to merge.