jf-pcs build regression: pin rust 1.83 (#2453)

* jf-pcs build regression: pin rust 1.83

- Use toolchain toml file from nix flake to also pin the same rust
  version in the nix dev env.
- Update flake.lock to include latest rust versions.

* cargo sort

Author: sveitser

Cargo.toml

@@ -21,12 +21,10 @@ members = [
     "sequencer",
     "tests",
     "types",
-    "utils",
+    "utils"
 ]
 
-exclude = [
-  "sequencer-sqlite"
-]
+exclude = ["sequencer-sqlite"]
 
 [workspace.dependencies]
 anyhow = "^1.0"