added parking_lot mutex

Cargo.lock

@@ -3515,6 +3515,7 @@ dependencies = [
  "directories",
  "ignore",
  "keyring",
+ "parking_lot",
  "proton-drive-rs",
  "proton-sdk",
  "rusqlite",
@@ -3534,6 +3535,7 @@ dependencies = [
  "image",
  "libc",
  "notify",
+ "parking_lot",
  "pdfs-core",
  "proton-drive-rs",
  "serde_json",