Update Xcode to 26.3-rc

Author: 1024jp

.github/workflows/Test.yml

@@ -6,7 +6,7 @@ jobs:
   macOS:
     runs-on: macos-26
     env:
-      DEVELOPER_DIR: /Applications/Xcode_26.2.app
+      DEVELOPER_DIR: /Applications/Xcode_26.3.app
 
     steps:
     - name: Show environments

CHANGELOG.md

@@ -10,6 +10,7 @@
 - Improve the behavior of trailing whitespace trimming.
 - Update the JSON syntax to highlight comments in the JSON5 format.
 - Improve stability.
+- [dev] Update the build environment to Xcode 26.3-rc.
 
 
 ### Fixes

CotEditor.xcodeproj/project.pbxproj

@@ -272,7 +272,7 @@
 				BuildIndependentTargetsInParallel = YES;
 				CLASSPREFIX = "";
 				LastSwiftUpdateCheck = 1240;
-				LastUpgradeCheck = 2620;
+				LastUpgradeCheck = 2630;
 				ORGANIZATIONNAME = "CotEditor Project";
 				TargetAttributes = {
 					2A3E847D1D07296200070A54 = {

CotEditor.xcodeproj/xcshareddata/xcschemes/CotEditor-Sparkle.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2620"
+   LastUpgradeVersion = "2630"
    version = "2.0">
    <BuildAction
       parallelizeBuildables = "YES"

CotEditor.xcodeproj/xcshareddata/xcschemes/CotEditor.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2620"
+   LastUpgradeVersion = "2630"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

CotEditor.xcodeproj/xcshareddata/xcschemes/UI Tests.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2620"
+   LastUpgradeVersion = "2630"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

CotEditor.xcodeproj/xcshareddata/xcschemes/Update Help Index.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2620"
+   LastUpgradeVersion = "2630"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"

README.md

@@ -43,7 +43,7 @@ CotEditor is a purely macOS native application written in Swift. It adheres to C
 ### Development Environment
 
 - macOS Tahoe 26
-- Xcode 26.2
+- Xcode 26.3
 - Swift 6.2 (partly in Swift 5 mode)
 - Sandbox and hardened runtime enabled