Fix get-task-allow entitlement (#41559)

We had apparently misspelled this entitlement, not allowing `lldb` to attach to official macOS builds.

(cherry picked from commit ad6740b)

Author: staticfloat

contrib/mac/app/Entitlements.plist

@@ -4,7 +4,7 @@
 <dict>
 	<key>com.apple.security.automation.apple-events</key>
 	<true/>
-	<key>com.apple.security.cs.get-task-allow</key>
+	<key>com.apple.security.get-task-allow</key>
 	<true/>
 	<key>com.apple.security.cs.allow-dyld-environment-variables</key>
 	<true/>