Dependencies: Bump proc-macro2 from 1.0.86 to 1.0.87

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.86 to 1.0.87.
- [Release notes](https://github.com/dtolnay/proc-macro2/releases)
- [Commits](dtolnay/proc-macro2@1.0.86...1.0.87)

---
updated-dependencies:
- dependency-name: proc-macro2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -70,7 +70,7 @@ lalrpop-util = { git = "https://github.com/lalrpop/lalrpop", rev = "b8b82e9ecde5
 num-traits = "0.2"
 num-derive = "0.4"
 arrcat = "0.1"
-proc-macro2 = "^1.0.86"
+proc-macro2 = "^1.0.87"
 human-panic = { version = "2", optional = true }
 flexstr = { version = "0.9.2", features = ["int_convert", "serde"] }
 hound = "3.5.1"