Bump to 2.2.0 for the Relocations API

The relocation metadata now surfaced through `compile`/`emit_asm` and the
`relocation_lowering` trait is additive: back-ends that don't opt in keep the
prior baking behavior. Minor bump.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: maleadt

Project.toml

@@ -1,6 +1,6 @@
 name = "GPUCompiler"
 uuid = "61eb1bfa-7361-4325-ad38-22787b887f55"
-version = "2.1.1"
+version = "2.2.0"
 authors = ["Tim Besard <tim.besard@gmail.com>"]
 
 [workspace]