Build: Stop testing on iOS 8-9 as BrowserStack removed them

Only iPads running on those iOS versions are available.

Ref jquery/jquery#5753

Author: mgol

.github/workflows/browserstack.yml

@@ -55,20 +55,18 @@ jobs:
           - '_:iPhone 13_iOS_15'
           - '_:iPhone 12_iOS_14'
           - '_:iPhone 11_iOS_13'
-            # iOS 12 & older is not officially supported by BrowserStack as
-            # it mostly runs on emulators instead of real devices. We include
-            # those versions as long as they still work.
+          # iOS 12 & older is not officially supported by BrowserStack as
+          # it mostly runs on emulators instead of real devices. We include
+          # those versions as long as they still work.
           - '_:iPhone XS_iOS_12'
           - '_:iPhone X_iOS_11'
-            # iOS 10 real device is in tier 4 as of January 2025 and its
-            # availability is poor, leading to frequent test timeouts. Emulators
-            # don't work either. Skip testing on this version.
-            # See https://www.browserstack.com/device-tiers
-            # - '_:iPhone 7_iOS_10'
-          - '_:iPhone 6S_iOS_9'
-          - '_:iPhone 6_iOS_8'
-            # iOS 7 emulators no longer work properly
-            # - '_:iPhone 5S_iOS_7'
+          # There's no longer any iPhone device or emulator running iOS 8-10
+          # available on BrowserStack. Skip testing on these versions.
+          # - '_:iPhone 7_iOS_10'
+          # - '_:iPhone 6S_iOS_9'
+          # - '_:iPhone 6_iOS_8'
+          # iOS 7 emulators no longer work properly
+          # - '_:iPhone 5S_iOS_7'
 
           - '_:iPad Air 13 2025_iOS_26'
           - '_:iPad Air 13 2025_iOS_18'