Update mockall requirement from 0.12.1 to 0.13.0 (#205)

Updates the requirements on [mockall](https://github.com/asomers/mockall) to permit the latest version.
- [Changelog](https://github.com/asomers/mockall/blob/master/CHANGELOG.md)
- [Commits](asomers/mockall@v0.12.1...v0.13.0)

---
updated-dependencies:
- dependency-name: mockall
  dependency-type: direct:production
...

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

tower-sessions-core/Cargo.toml

@@ -34,4 +34,4 @@ tracing = { version = "0.1.40", features = ["log"] }
 tower-sessions = { workspace = true, features = ["memory-store"] }
 tokio-test = "0.4.3"
 tokio = { workspace = true, features = ["rt", "macros"] }
-mockall = "0.12.1"
+mockall = "0.13.0"