darkfi: add `thiserror` to the explorerd package in `Cargo.lock`

This commit adds `thiserror 2.0.11` as a dependency to the `explorerd` package in the project's `Cargo.lock`.

Cargo.lock

@@ -3067,6 +3067,7 @@ dependencies = [
  "structopt-toml",
  "tar",
  "tempdir",
+ "thiserror 2.0.11",
  "tinyjson",
  "toml 0.8.20",
  "url",