Bump rustls from 0.20.4 to 0.20.6

Bumps [rustls](https://github.com/rustls/rustls) from 0.20.4 to 0.20.6.
- [Release notes](https://github.com/rustls/rustls/releases)
- [Changelog](https://github.com/rustls/rustls/blob/main/RELEASE_NOTES.md)
- [Commits](https://github.com/rustls/rustls/compare/v/0.20.4...v/0.20.6)

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

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

Cargo.lock

@@ -3126,9 +3126,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.20.4"
+version = "0.20.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4fbfeb8d0ddb84706bc597a5574ab8912817c52a397f819e5b614e2265206921"
+checksum = "5aab8ee6c7097ed6057f43c187a62418d0c05a4bd5f18b3571db50ee0f9ce033"
 dependencies = [
  "log",
  "ring",