test(ci): switch to macos-15 runners to avoid iOS SDK 18.2 issue

it appears the macos-14 runners have a simulator definition issue,
which breaks our tests on macos-14. macos-15 apparently does not
suffer the same, and is the future anyway. switch now

Author: mikehardy

.github/workflows/tests_e2e_ios.yml

@@ -27,7 +27,7 @@ concurrency:
 jobs:
   ios:
     name: iOS
-    runs-on: macos-14-xlarge
+    runs-on: macos-15-xlarge
     # TODO matrix across APIs, at least 11 and 15 (lowest to highest)
     timeout-minutes: 60
     env:

.github/workflows/tests_e2e_other.yml

@@ -27,7 +27,7 @@ concurrency:
 jobs:
   other:
     name: Other
-    runs-on: macos-14-xlarge
+    runs-on: macos-15-xlarge
     timeout-minutes: 100
     env:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}