build(deps): Bump semver from 1.0.19 to 1.0.20

Bumps [semver](https://github.com/dtolnay/semver) from 1.0.19 to 1.0.20.
- [Release notes](https://github.com/dtolnay/semver/releases)
- [Commits](dtolnay/semver@1.0.19...1.0.20)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -24,6 +24,6 @@ mdbook = { version = "0.4.35", default_features = false }
 env_logger = "0.10.0"
 log = "0.4.20"
 serde_json = "1.0.105"
-semver = "1.0.19"
+semver = "1.0.20"
 toml_edit = "0.20.1"
 version-compare = "0.1.1"