build: Bump rust-keystore from v0.1.2 to v0.1.3 in /backend

Bumps [rust-keystore](https://github.com/andrewinci/rust-keystore) from v0.1.2 to v0.1.3.
- [Release notes](https://github.com/andrewinci/rust-keystore/releases)
- [Commits](andrewinci/rust-keystore@fbbf2ba...36d0d80)

---
updated-dependencies:
- dependency-name: rust-keystore
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

backend/Cargo.lock

@@ -29,7 +29,7 @@ async-trait = "0.1.71"
 num-bigint = "0.4"
 rust_decimal = "1.30"
 rusqlite = { version = "0.28.0", features = ["bundled", "backup", "hooks"] }
-rust-keystore = { git = "https://github.com/andrewinci/rust-keystore", features = ["p12"], tag = "v0.1.2" }
+rust-keystore = { git = "https://github.com/andrewinci/rust-keystore", features = ["p12"], tag = "v0.1.3" }
 r2d2 = "0.8.10"
 r2d2_sqlite = "0.21.0"
 toml = "0.7"