Enable libadwaita feature of Relm4, remove unused direct Tokio dep

Cargo.lock

@@ -924,18 +924,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72a2903cd7736441aac9df9d7688bd0ce48edccaadf181c3b90be801e81d3d86"
 dependencies = [
  "pin-project-lite",
- "tokio-macros",
-]
-
-[[package]]
-name = "tokio-macros"
-version = "2.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af407857209536a95c8e56f8231ef2c2e2aff839b22e07a1ffcbc617e9db9fa5"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
 ]
 
 [[package]]
@@ -1122,5 +1110,4 @@ dependencies = [
  "gtk4",
  "libadwaita",
  "relm4",
- "tokio",
 ]

Cargo.toml

@@ -17,7 +17,4 @@ glib-build-tools = "0.21.0"
 async-sqlite = { version = "0.5.4", default-features = false }
 gtk4 = { version = "0.10.3", features = ["v4_20"] }
 libadwaita = { version = "0.8.1", features = ["v1_8"] }
-relm4 = { version = "0.10.1", features = ["gnome_48"] }
-# Tokio as included in Relm4 doesn't have the macros feature enabled.
-# Keep version in sync with the one Relm4 uses.
-tokio = { version = "1.47.3", features = ["macros", "rt", "rt-multi-thread", "sync"] }
+relm4 = { version = "0.10.1", features = ["gnome_48", "libadwaita"] }