Bump quote from 1.0.20 to 1.0.21 (#152)

Bumps [quote](https://github.com/dtolnay/quote) from 1.0.20 to 1.0.21.
- [Release notes](https://github.com/dtolnay/quote/releases)
- [Commits](https://github.com/dtolnay/quote/compare/1.0.20...1.0.21)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.lock

@@ -1020,9 +1020,9 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.20"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3bcdf212e9776fbcb2d23ab029360416bb1706b1aea2d1a5ba002727cbcab804"
+checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
 dependencies = [
  "proc-macro2",
 ]