Update Swift 6.3 toolchain and dependencies (#29)

Author: Kyle-Ye

.github/workflows/compatibility_tests.yml

@@ -14,8 +14,10 @@ jobs:
       matrix:
         include:
           - os: macos-15
-            xcode-version: "26.3"   # Swift 6.2.4
-    runs-on: ${{ matrix.os }}
+            xcode-version: "26.6"   # Swift 6.3.3
+    runs-on:
+      - ${{ matrix.os }}
+      - xcode-26.6
     env:
       OPENRENDERBOX_WERROR: 1
       OPENRENDERBOX_RENDERBOX: 1

.github/workflows/ios.yml

@@ -13,12 +13,14 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-15]
-        xcode-version: ["26.3"]   # Swift 6.2.4
+        xcode-version: ["26.6"]   # Swift 6.3.3
         ios-version: ["18.5"]
         include:
           - ios-version: "18.5"
             ios-simulator-name: "iPhone 16 Pro"
-    runs-on: ${{ matrix.os }}
+    runs-on:
+      - ${{ matrix.os }}
+      - xcode-26.6
     env:
       OPENRENDERBOX_WERROR: 1
       OPENRENDERBOX_RENDERBOX: 0

.github/workflows/macos.yml

@@ -13,8 +13,10 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-15]
-        xcode-version: ["26.3"]   # Swift 6.2.4
-    runs-on: ${{ matrix.os }}
+        xcode-version: ["26.6"]   # Swift 6.3.3
+    runs-on:
+      - ${{ matrix.os }}
+      - xcode-26.6
     env:
       OPENRENDERBOX_WERROR: 1
       OPENRENDERBOX_RENDERBOX: 0

.github/workflows/ubuntu.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        swift_version: ["6.2.4"]
+        swift_version: ["6.3.3"]
     runs-on: ubuntu-22.04
     env:
       OPENRENDERBOX_WERROR: 1

Package.resolved

@@ -1,4 +1,4 @@
-// swift-tools-version: 6.2
+// swift-tools-version: 6.3
 
 import Foundation
 import PackageDescription

Package.swift

@@ -20,7 +20,7 @@ Currently, this project is in early development.
 
 ## Build
 
-The current suggested toolchain to build the project is Swift 6.2.4 / Xcode 26.3.
+The current suggested toolchain to build the project is Swift 6.3.3 / Xcode 26.6.
 
 ## Supported platforms