chore: Update to LLVM 20

Latest Rust nightly switched to LLVM 20, so we need to update in order
to support rustc-llvm-proxy.

Author: tamird

.github/workflows/ci.yml

@@ -58,7 +58,7 @@ jobs:
           - beta
           - nightly
         llvm:
-          - 19
+          - 20
           - source
     name: rustc=${{ matrix.rust }} llvm=${{ matrix.llvm }}
     needs: llvm

.github/workflows/llvm.yml

@@ -16,7 +16,7 @@ jobs:
       - id: ls-remote
         run: |
           set -euxo pipefail
-          value=$(git ls-remote https://github.com/aya-rs/llvm-project.git refs/heads/rustc/19.1-2024-09-17 | cut -f1)
+          value=$(git ls-remote https://github.com/aya-rs/llvm-project.git refs/heads/rustc/20.1-2025-02-13 | cut -f1)
           echo "sha=$value" >> "$GITHUB_OUTPUT"
 
       - id: cache-key

tests/tests.rs

@@ -100,7 +100,7 @@ fn btf_dump(src: &Path, dst: &Path) {
     btf.arg("dump").arg(src).stdout(dst);
     let status = btf
         .status()
-        .unwrap_or_else(|err| panic!("could not run {btf:?}: {err}",));
+        .unwrap_or_else(|err| panic!("could not run {btf:?}: {err}"));
     assert_eq!(status.code(), Some(0), "{btf:?} failed");
 }