Switch rspirv to the latest git version

Author: kvark

Cargo.lock

@@ -173,7 +173,7 @@ rwh_05 = { version = "0.5.2", package = "raw-window-handle" } # temporary compat
 rayon = "1.3"
 regex-lite = "0.1"
 renderdoc-sys = "1"
-rspirv = "0.12"
+rspirv = { git = "https://github.com/gfx-rs/rspirv", rev = "89ce4d0e64c91b0635f617409dc57cb031749a39" }
 ron = "0.11"
 # NOTE: rustc-hash v2 is a completely different hasher with different performance characteristics
 # see discussion here (including with some other alternatives): https://github.com/gfx-rs/wgpu/issues/6999