Removed minimum target macOS 11.0 branching (#11266)

### Summary
Removed minimum target macOS 11.0 branching.

Fixes #11259 [Issue](#11259)

Author: NeelakshSharma

backends/apple/coreml/runtime/delegate/ETCoreMLDefaultModelExecutor.mm

@@ -27,7 +27,7 @@ - (instancetype)initWithModel:(ETCoreMLModel *)model {
                                                  eventLogger:(const executorchcoreml::ModelEventLogger* _Nullable __unused)eventLogger
                                                        error:(NSError * __autoreleasing *)error {
     if (self.ignoreOutputBackings) {
-        if (@available(macOS 11.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *)) {
+        if (@available(iOS 16.0, tvOS 16.0, watchOS 9.0, *)) {
             predictionOptions.outputBackings = @{};
         }
     }

backends/apple/coreml/runtime/delegate/ETCoreMLModelManager.mm

@@ -92,7 +92,7 @@ BOOL is_backed_by_same_buffer(MLMultiArray *array1, MLMultiArray *array2) {
                                             NSOrderedSet<NSString *> *output_names,
                                             NSError * __autoreleasing *error) {
     MLPredictionOptions *options = [MLPredictionOptions new];
-    if (@available(macOS 11.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *)) {
+    if (@available(iOS 16.0, tvOS 16.0, watchOS 9.0, *)) {
         NSMutableDictionary<NSString *, id> *output_backings = [NSMutableDictionary dictionary];
         NSEnumerator<NSString *> *enumerator = [output_names objectEnumerator];
         for (MLMultiArray *output in outputs) {
@@ -687,7 +687,7 @@ - (void)addPrewarmedAsset:(ETCoreMLAsset *)asset {
                                                                  eventLogger:eventLogger
                                                                        error:&localError];
     // Try without output backings.
-    if (@available(macOS 11.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *)) {
+    if (@available(iOS 16.0, tvOS 16.0, watchOS 9.0, *)) {
         if (!modelOutputs && predictionOptions.outputBackings.count > 0) {
             executor.ignoreOutputBackings = YES;
             localError = nil;