Update link for Rust Manchester meetup

Rust Manchester is attempting to move away from meetup so the website contains all meetup information and will be stick around once they transition to a new ticketing service

Author: seam345

data.toml

@@ -47,4 +47,4 @@ link = "https://www.meetup.com/rust-and-c-plus-plus-in-cardiff/"
 [[meetups]]
 name = "Rust Manchester"
 location = "Manchester"
-link = "https://www.meetup.com/rust-manchester/"
+link = "https://rustmanchester.co.uk/"