[Feature] Update Mermaid to v11.15.0+, for Nested Namespaces support

[xusiwei]

Currently, Typora doesn't support nested namespaces; you need to upgrade Mermaid to version 11.15.0 to get this feature.

For example, a Mermaid class diagram like this:

classDiagram
    namespace Platform {
        namespace Auth {
            class UserService {
                +login()
                +logout()
            }
        }
        namespace Data {
            class Repository {
                +find()
                +save()
            }
        }
        class Gateway {
            +route()
        }
    }
    Gateway --> UserService : delegates
    Gateway --> Repository : delegates

classDiagram
    namespace Platform {
        namespace Auth {
            class UserService {
                +login()
                +logout()
            }
        }
        namespace Data {
            class Repository {
                +find()
                +save()
            }
        }
        class Gateway {
            +route()
        }
    }
    Gateway --> UserService : delegates
    Gateway --> Repository : delegates

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