Update color-backtrace requirement from 0.5.1 to 0.6.0

Updates the requirements on [color-backtrace](https://github.com/athre0z/color-backtrace) to permit the latest version.
- [Changelog](https://github.com/athre0z/color-backtrace/blob/master/CHANGELOG.md)
- [Commits](athre0z/color-backtrace@v0.5.1...v0.6.0)

---
updated-dependencies:
- dependency-name: color-backtrace
  dependency-type: direct:production
...

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

Cargo.toml

@@ -50,7 +50,7 @@ libc = "0.2.96"
 crc32fast = "1.2.1"
 log = "0.4.14"
 parking_lot = "0.12.1"
-color-backtrace = { version = "0.5.1", optional = true }
+color-backtrace = { version = "0.6.0", optional = true }
 num-format = { version = "0.4.0", optional = true }
 backtrace = { version = "0.3.60", optional = true }
 im = "15.1.0"