[DO NOT LAND] bump Salsa version (astral-sh#17176)

Update to latest Salsa main branch, so as to get a baseline for
measuring the perf effect of salsa-rs/salsa#786
on red-knot in isolation from other recent changes in Salsa main branch.

Author: carljm

Diff for: Cargo.lock

@@ -124,7 +124,7 @@ rayon = { version = "1.10.0" }
 regex = { version = "1.10.2" }
 rustc-hash = { version = "2.0.0" }
 # When updating salsa, make sure to also update the revision in `fuzz/Cargo.toml`
-salsa = { git = "https://github.com/salsa-rs/salsa.git", rev = "d758691ba17ee1a60c5356ea90888d529e1782ad" }
+salsa = { git = "https://github.com/salsa-rs/salsa.git", rev = "395b29d08ad1de0f4f3ac057057219f40e2f6388"}
 schemars = { version = "0.8.16" }
 seahash = { version = "4.1.0" }
 serde = { version = "1.0.197", features = ["derive"] }

Diff for: Cargo.toml

@@ -29,7 +29,7 @@ ruff_python_formatter = { path = "../crates/ruff_python_formatter" }
 ruff_text_size = { path = "../crates/ruff_text_size" }
 
 libfuzzer-sys = { git = "https://github.com/rust-fuzz/libfuzzer", default-features = false }
-salsa = { git = "https://github.com/salsa-rs/salsa.git", rev = "d758691ba17ee1a60c5356ea90888d529e1782ad" }
+salsa = { git = "https://github.com/salsa-rs/salsa.git", rev = "395b29d08ad1de0f4f3ac057057219f40e2f6388"}
 similar = { version = "2.5.0" }
 tracing = { version = "0.1.40" }