use salsa for the config tree

Author: cormacrelf

Cargo.lock

@@ -100,6 +100,7 @@ nohash-hasher = "0.2.0"
 text-size = "1.1.0"
 serde = { version = "1.0.156", features = ["derive"] }
 serde_json = "1.0.96"
+salsa  = "0.17.0-pre.2"
 triomphe = { version = "0.1.8", default-features = false, features = ["std"] }
 # can't upgrade due to dashmap depending on 0.12.3 currently
 hashbrown = { version = "0.12.3", features = [

Cargo.toml

@@ -12,7 +12,7 @@ rust-version.workspace = true
 doctest = false
 
 [dependencies]
-salsa = "0.17.0-pre.2"
+salsa.workspace = true
 rustc-hash = "1.1.0"
 
 triomphe.workspace = true

crates/base-db/Cargo.toml

@@ -75,8 +75,7 @@ toolchain.workspace = true
 vfs-notify.workspace = true
 vfs.workspace = true
 la-arena.workspace = true
-indextree = "4.6.0"
-slotmap = "1.0.7"
+salsa.workspace = true
 
 [target.'cfg(windows)'.dependencies]
 winapi = "0.3.9"