[cr144] Update to Xcode 26.1

Chromium changes:
https://chromium.googlesource.com/chromium/src/+/df38f1049b2f5010cc7155bd787676127ae03c79

commit df38f1049b2f5010cc7155bd787676127ae03c79
Author: Mark Mentovai <mark@chromium.org>
Date:   Tue Nov 4 10:51:11 2025 -0800

    mac: Switch to Xcode 26.1 17B55 (2025-11-03) and SDK 26.1 25B74

    Change-Id: I3b9bcb8fa49fa619c2a96a0c102f81763b610964
    Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7118940
    Commit-Queue: Mark Mentovai <mark@chromium.org>
    Reviewed-by: Nico Weber <thakis@chromium.org>
    Reviewed-by: Mark Mentovai <mark@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#1540182}

Author: cdesouza-chromium

build/mac/download_hermetic_xcode.py

@@ -21,12 +21,12 @@ def LoadPList(path):
     with open(path, 'rb') as f:
         return plistlib.load(f)
 
-# This contains binaries from Xcode 16.4, along with the macOS 15.5 SDK
-XCODE_VERSION = '26.0'
+# This contains binaries from Xcode 26.1, along with the macOS 26.1 SDK
+XCODE_VERSION = '26.1'
 HERMETIC_XCODE_BINARY = (
     DEPS_PACKAGES_INTERNAL_URL +
-    '/xcode-hermetic-toolchain/xcode-hermetic-toolchain-xcode-' +
-    XCODE_VERSION + '-sdk-26.0-15.5.tar.gz')
+    '/xcode-hermetic-toolchain/xcode-hermetic-toolchain-' + XCODE_VERSION +
+    '.tar.gz')
 
 # The toolchain will not be downloaded if the minimum OS version is not met. 19
 # is the major version number for macOS 10.15. Xcode 13.2 13C90 only runs on