Update to Swift 6.3.3 and Xcode 26.6 - #69

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, jdx/mise-action@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

double-quoted include "RBTargetConditionals.h" in framework header, expected angle-bracketed instead [-Wquoted-include-in-framework-header]

double-quoted include "RBSwiftSupport.h" in framework header, expected angle-bracketed instead [-Wquoted-include-in-framework-header]

double-quoted include "RBTargetConditionals.h" in framework header, expected angle-bracketed instead [-Wquoted-include-in-framework-header]