chore: update patch-db submodule

Updates patch-db submodule and adjusts Cargo.toml path from
patch-db/patch-db to patch-db/core. Switches from serde_cbor
to ciborium.

core/Cargo.lock

@@ -4345,6 +4345,7 @@ name = "patch-db"
 version = "0.1.0"
 dependencies = [
  "async-trait",
+ "ciborium",
  "fd-lock-rs",
  "futures",
  "imbl",
@@ -4355,7 +4356,6 @@ dependencies = [
  "nix 0.30.1",
  "patch-db-macro",
  "serde",
- "serde_cbor 0.11.1",
  "thiserror 2.0.18",
  "tokio",
  "tracing",
@@ -5377,7 +5377,7 @@ dependencies = [
  "pin-project",
  "reqwest",
  "serde",
- "serde_cbor 0.11.2",
+ "serde_cbor",
  "serde_json",
  "thiserror 2.0.18",
  "tokio",
@@ -5783,14 +5783,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "serde_cbor"
-version = "0.11.1"
-dependencies = [
- "half 1.8.3",
- "serde",
-]
-
 [[package]]
 name = "serde_cbor"
 version = "0.11.2"