Fix Cargo workspace warnings

Set resolver = "3" in the workspace root to match edition 2024, and
remove the ignored [profile.release] from relay-compiler-playground
since per-crate profiles are not supported in workspace members.

Author: captbaritone

compiler/Cargo.toml

@@ -1,4 +1,5 @@
 [workspace]
+resolver = "3"
 members = [
     "crates/common",
     "crates/dependency-analyzer",

compiler/crates/relay-compiler-playground/Cargo.toml

@@ -44,9 +44,5 @@ wee_alloc = { version = "0.4.5", optional = true }
 [dev-dependencies]
 wasm-bindgen-test = "0.3.13"
 
-[profile.release]
-# Tell `rustc` to optimize for small code size.
-opt-level = "s"
-
 [package.metadata.wasm-pack.profile.release]
 wasm-opt = ["-Oz", "--enable-mutable-globals"]