Swift: Added support for new Swift 5.5 keywords (#2988)

Author: AvdLee

components/prism-swift.js

@@ -16,7 +16,7 @@ Prism.languages.swift = Prism.languages.extend('clike', {
 			}
 		}
 	},
-	'keyword': /\b(?:as|associativity|break|case|catch|class|continue|convenience|default|defer|deinit|didSet|do|dynamic(?:Type)?|else|enum|extension|fallthrough|final|for|func|get|guard|if|import|in|infix|init|inout|internal|is|lazy|left|let|mutating|new|none|nonmutating|operator|optional|override|postfix|precedence|prefix|private|protocol|public|repeat|required|rethrows|return|right|safe|self|Self|set|some|static|struct|subscript|super|switch|throws?|try|Type|typealias|unowned|unsafe|var|weak|where|while|willSet|__(?:COLUMN__|FILE__|FUNCTION__|LINE__))\b/,
+	'keyword': /\b(?:actor|as|associativity|async|await|break|case|catch|class|continue|convenience|default|defer|deinit|didSet|do|dynamic(?:Type)?|else|enum|extension|fallthrough|final|for|func|get|guard|if|import|in|infix|init|inout|internal|is|lazy|left|let|mutating|new|none|nonisolated|nonmutating|operator|optional|override|postfix|precedence|prefix|private|protocol|public|repeat|required|rethrows|return|right|safe|self|Self|set|some|static|struct|subscript|super|switch|throws?|try|Type|typealias|unowned|unsafe|var|weak|where|while|willSet|__(?:COLUMN__|FILE__|FUNCTION__|LINE__))\b/,
 	'number': /\b(?:[\d_]+(?:\.[\de_]+)?|0x[a-f0-9_]+(?:\.[a-f0-9p_]+)?|0b[01_]+|0o[0-7_]+)\b/i,
 	'constant': /\b(?:nil|[A-Z_]{2,}|k[A-Z][A-Za-z_]+)\b/,
 	'atrule': /@\b(?:IB(?:Outlet|Designable|Action|Inspectable)|class_protocol|exported|noreturn|NS(?:Copying|Managed)|objc|UIApplicationMain|auto_closure)\b/,

components/prism-swift.min.js

@@ -1,5 +1,8 @@
+actor
 as
 associativity
+async
+await
 break
 case
 catch
@@ -36,6 +39,7 @@ let
 mutating
 new;
 none
+nonisolated
 nonmutating
 operator
 optional
@@ -81,8 +85,11 @@ __LINE__
 ----------------------------------------------------
 
 [
+	["keyword", "actor"],
 	["keyword", "as"],
 	["keyword", "associativity"],
+	["keyword", "async"],
+	["keyword", "await"],
 	["keyword", "break"],
 	["keyword", "case"],
 	["keyword", "catch"],
@@ -119,6 +126,7 @@ __LINE__
 	["keyword", "mutating"],
 	["keyword", "new"], ["punctuation", ";"],
 	["keyword", "none"],
+	["keyword", "nonisolated"],
 	["keyword", "nonmutating"],
 	["keyword", "operator"],
 	["keyword", "optional"],