Update unindent requirement from 0.1.5 to 0.2.0

Updates the requirements on [unindent](https://github.com/dtolnay/indoc) to permit the latest version.
- [Release notes](https://github.com/dtolnay/indoc/releases)
- [Commits](dtolnay/indoc@0.1.5...0.2.0)

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

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

Author: dependabot[bot]

bindings-generator/Cargo.toml

@@ -24,5 +24,5 @@ quote = "1"
 regex = { version = "1.5.5", default-features = false, features = ["std"] } # for security: https://blog.rust-lang.org/2022/03/08/cve-2022-24713.html
 roxmltree = "0.17"
 syn = { version = "1", features = ["full", "extra-traits", "visit"] }
-unindent = "0.1.5"
+unindent = "0.2.0"
 which = { optional = true, version = "4" }