Update compiletest_rs requirement from 0.10 to 0.11 (#455)

Updates the requirements on [compiletest_rs](https://github.com/Manishearth/compiletest-rs) to permit the latest version.
- [Release notes](https://github.com/Manishearth/compiletest-rs/releases)
- [Commits](Manishearth/compiletest-rs@v0.10.0...v0.11.0)

---
updated-dependencies:
- dependency-name: compiletest_rs
  dependency-type: direct:production
...

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

proptest-derive/Cargo.toml

@@ -27,7 +27,7 @@ proptest = { version = "1.0.0", path = "../proptest" }
 # features. However, due to
 # https://github.com/laumann/compiletest-rs/issues/166, the default features of
 # compiletest-rs fail to compile, but the stable fallback works fine.
-compiletest_rs = { version = "0.10", features = ["tmp", "stable"] }
+compiletest_rs = { version = "0.11", features = ["tmp", "stable"] }
 # criterion is used for benchmarks.
 criterion = "0.5"