Update Mojolicious to 7.60

• Deprecated use of Mojo::Promise::all and Mojo::Promise::race as instance methods.
• Improved all and race methods in Mojo::Promise to be able to handle arbitrary then-ables.
• Improved number detection in Mojo::JSON with a workaround for an upcoming breaking change in Perl 5.28. (haarg)
• Improved HTML Living Standard compliance of Mojo::DOM::HTML.
• Fixed a bug in Mojo::Base that prevented composition of multiple roles. (aferreira, batman)
• Fixed a bug in Mojolicious::Static where text files from DATA sections would not be UTF-8 encoded. (Grinnz)