Bug 1856263 - Port bug 1855564: Switch Firefox builds to macOS 14.0 SDK. rs=bustage-fix

--HG--
extra : amend_source : 03dda81dbb31402f279bd3c7eb570d2e98144184

taskcluster/ci/toolchain/libotr.yml

@@ -57,7 +57,7 @@ macosx64-x64-libotr:
         symbol: TM(libotr)
     worker:
         env:
-            MACOS_SDK_DIR: "MacOSX13.3.sdk"
+            MACOS_SDK_DIR: "MacOSX14.0.sdk"
             MACOS_TARGET_SDK: "10.15"
     run:
         arguments: ['macosx64']
@@ -74,7 +74,7 @@ macosx64-aarch64-libotr:
         symbol: TM(libotr-aarch64)
     worker:
         env:
-            MACOS_SDK_DIR: "MacOSX13.3.sdk"
+            MACOS_SDK_DIR: "MacOSX14.0.sdk"
             MACOS_TARGET_SDK: "11.0"
     run:
         arguments: ['macosx64-aarch64']