Fix build error with -Z minimal-versions

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

CHANGELOG.md

@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Fix build error from dependency when built with `-Z minimal-versions`.
+
 ## [1.1.0] - 2023-05-13
 
 - Update `syn` dependency to 2. This increase the minimum supported Rust version from Rust 1.37 to Rust 1.56. ([#352](https://github.com/taiki-e/pin-project/pull/352), [#354](https://github.com/taiki-e/pin-project/pull/354), thanks @maurer and @daxpedda)

pin-project-internal/Cargo.toml

@@ -18,7 +18,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 proc-macro = true
 
 [dependencies]
-proc-macro2 = "1"
+proc-macro2 = "1.0.60"
 quote = "1"
 syn = { version = "2.0.1", features = ["full", "visit-mut"] }