build(deps): use macos-15 vs macos-15-xlarge instances

I don't think the speedup is that significant but the smaller runner
should be more cost-efficient

Author: mikehardy

.github/workflows/tests_e2e_ios.yml

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