chore: Update SDK version to 26.2 for MacOS artifact builds, b=no-bug, c=workflows, configs

.github/workflows/macos-release-build.yml

@@ -128,6 +128,7 @@ jobs:
           # Always exist with 0, even if bootstrap fails
           ./mach --no-interactive bootstrap --application-choice browser --exclude macos-sdk || true
           cd ..
+          ls /Library/Developer/CommandLineTools/SDKs/MacOSX26.2.sdk
 
       - name: Build language packs
         run: sh scripts/download-language-packs.sh

configs/macos/mozconfig

@@ -47,7 +47,7 @@ else
 fi
 
 if test "$ZEN_RELEASE"; then
-  ac_add_options --with-macos-sdk=/Library/Developer/CommandLineTools/SDKs/MacOSX26.1.sdk
+  ac_add_options --with-macos-sdk=/Library/Developer/CommandLineTools/SDKs/MacOSX26.2.sdk
 fi
 
 # Keep using ld64 on PGO/LTO builds because of performance regressions when using lld.