Bump pem from 3.0.6 to 4.0.0 (#701)

Bumps [pem](https://github.com/jcreekmore/pem-rs) from 3.0.6 to 4.0.0.
- [Changelog](https://github.com/jcreekmore/pem-rs/blob/master/CHANGELOG.md)
- [Commits](jcreekmore/pem-rs@v3.0.6...v4.0.0)

---
updated-dependencies:
- dependency-name: pem
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

@@ -26,7 +26,7 @@ futures = "0.3"
 geo-types = "0.7"
 logos = "0.16"
 native-tls = "0.2"
-pem = "3.0"
+pem = "4.0"
 postgres-native-tls = "0.5.0"
 rust_decimal = { version = "1.38", features = ["db-postgres"] }
 sea-query = { version = "1.0.0", features = ["backend-postgres", "postgres-array", "with-rust_decimal", "with-bigdecimal", "with-time", "with-chrono"] }