Fix -Zminimal-versions build

    error[E0635]: unknown feature `proc_macro_span_shrink`
      --> index.crates.io-6f17d22bba15001f/proc-macro2-1.0.52/src/lib.rs:92:30
       |
    92 |     feature(proc_macro_span, proc_macro_span_shrink)
       |                              ^^^^^^^^^^^^^^^^^^^^^^

Cargo.toml

@@ -13,7 +13,7 @@ repository = "https://github.com/dtolnay/quote"
 rust-version = "1.31"
 
 [dependencies]
-proc-macro2 = { version = "1.0.52", default-features = false }
+proc-macro2 = { version = "1.0.63", default-features = false }
 
 [dev-dependencies]
 rustversion = "1.0"