buck2: Remove uneeded llvm dep (#30338)

Related: chainguard-dev/internal-dev#1545

buck2.yaml

@@ -5,7 +5,7 @@ package:
   # - https://github.com/facebook/buck2/blob/<VERSION>/HACKING.md
   # Get the version, and update vars.rust-version below.
   version: 20241001
-  epoch: 0
+  epoch: 1
   description: "Build system, successor to Buck"
   copyright:
     - license: MIT
@@ -20,7 +20,6 @@ environment:
       - busybox
       - ca-certificates-bundle
       - cargo-auditable
-      - libLLVM-18
       - rustup
       - wolfi-base