[bots] Increase timeout for dart2js-hostasserts-(weak|strong) configurations

Change-Id: I3f254ff4f062014677430c75bff17b836bba0a7d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/143722
Reviewed-by: Alexander Thomas <athom@google.com>
Reviewed-by: Joshua Litt <joshualitt@google.com>
Commit-Queue: Sigmund Cherem <sigmund@google.com>

tools/bots/test_matrix.json

@@ -630,6 +630,7 @@
           "--libraries-spec=sdk_nnbd/lib/libraries.json",
           "--platform-binaries=out/ReleaseX64NNBD/"
         ],
+        "timeout": 240,
         "host-checked": true
       }
     },
@@ -644,6 +645,7 @@
           "--libraries-spec=sdk_nnbd/lib/libraries.json",
           "--platform-binaries=xcodebuild/ReleaseX64NNBD/"
         ],
+        "timeout": 240,
         "host-checked": true
       }
     },
@@ -658,6 +660,7 @@
           "--libraries-spec=sdk_nnbd/lib/libraries.json",
           "--platform-binaries=out/ReleaseX64NNBD/"
         ],
+        "timeout": 240,
         "host-checked": true
       }
     },
@@ -672,6 +675,7 @@
           "--libraries-spec=sdk_nnbd/lib/libraries.json",
           "--platform-binaries=xcodebuild/ReleaseX64NNBD/"
         ],
+        "timeout": 240,
         "host-checked": true
       }
     },
@@ -3692,4 +3696,4 @@
     "linux": "buildtools/linux-x64/clang/bin/llvm-symbolizer",
     "macos": "buildtools/mac-x64/clang/bin/llvm-symbolizer"
   }
-}
+}