Bump symbolic-demangle from 8.5.0 to 8.6.0 (mozilla#777)

Bumps [symbolic-demangle](https://github.com/getsentry/symbolic) from 8.5.0 to 8.6.0.
- [Release notes](https://github.com/getsentry/symbolic/releases)
- [Changelog](https://github.com/getsentry/symbolic/blob/master/CHANGELOG.md)
- [Commits](getsentry/symbolic@8.5.0...8.6.0)

---
updated-dependencies:
- dependency-name: symbolic-demangle
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

Author: dependabot[bot]

Cargo.lock

@@ -65,7 +65,7 @@ simplelog = "0.11"
 smallvec = "1.8"
 structopt = "0.3.26"
 symbolic-common = "8.6"
-symbolic-demangle = { version = "8.5", default-features = false }
+symbolic-demangle = { version = "8.6", default-features = false }
 tempfile = "3.3"
 tera = "1.15"
 uuid = { version = "0.8", features = ["v4"] }