Build: Test on iOS 18, no longer test on iOS 15

Closes jquerygh-5553

Author: mgol

.github/workflows/browserstack.yml

@@ -31,9 +31,9 @@ jobs:
           - 'Edge_latest-1'
           - 'Firefox_latest'
           - 'Firefox_latest-1'
+          - '__iOS_18'
           - '__iOS_17'
           - '__iOS_16'
-          - '__iOS_15'
     steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2