[ios, macos] Update minimum deployment versions to iOS 9, macOS 10.11 (#11776)

* [ios] Remove iOS 8 conditionals

* [ios, macos] Bump pod deployment targets

* [ios, macos] Add changelog entries

* [ios, macos] Update docs

* Remove unnecessary selector-based version checks

* Update SQLite note

* [ios, macos] Replace lightweight generics macros with direct use
   Lightweight generics for Foundation collections are available everywhere with the bump to iOS 9 and macOS 10.11.

* Update deprecated macOS method

platform/default/sqlite3.cpp

@@ -291,11 +291,12 @@ template <> void Query::bind(int offset, const char *value) {
 }
 
 // We currently cannot use sqlite3_bind_blob64 / sqlite3_bind_text64 because they
-// was introduced in SQLite 3.8.7, and we need to support earlier versions:
-//    iOS 8.0: 3.7.13
-//    iOS 8.2: 3.8.5
-// According to http://stackoverflow.com/questions/14288128/what-version-of-sqlite-does-ios-provide,
-// the first iOS version with 3.8.7+ was 9.0, with 3.8.8.
+// were introduced in SQLite 3.8.7, and we need to support earlier versions:
+//    Android 11: 3.7
+//    Android 21: 3.8
+//    Android 24: 3.9
+// Per https://developer.android.com/reference/android/database/sqlite/package-summary.
+// The first iOS version with 3.8.7+ was 9.0, with 3.8.8.
 
 void Query::bind(int offset, const char * value, std::size_t length, bool retain) {
     assert(stmt.impl);