fix: use in-flake version of rocksdb instead of nixpkgs' upstream package

Fixes #1801

nix/packages/continuwuity.nix

@@ -5,12 +5,11 @@
   liburing,
   craneLib,
   pkg-config,
-  callPackage,
   rustPlatform,
   cargoExtraArgs ? "",
   rustflags ? "",
   target_cpu ? null,
-  rocksdb ? callPackage ./rocksdb.nix { },
+  rocksdb,
   profile ? "release",
 }:
 let

nix/packages/default.nix

@@ -15,6 +15,7 @@
         rocksdb = pkgs.callPackage ./rocksdb.nix { };
         default = pkgs.callPackage ./continuwuity.nix {
           inherit self craneLib;
+          inherit (self'.packages) rocksdb;
           # extra features via `cargoExtraArgs`
           cargoExtraArgs = "-F http3";
           # extra RUSTFLAGS via `rustflags`