[llvm] [GitHub] Bump clang-tidy version to 21th and add sccache in CI (PR #160551)

[Baranov Victor via llvm-commits]

https://github.com/vbvictor updated https://github.com/llvm/llvm-project/pull/160551

>From 2f3e0b41644d3f6e3696818940e7b9863bfa265d Mon Sep 17 00:00:00 2001
From: Victor Baranov <bar.victor.2002 at gmail.com>
Date: Wed, 24 Sep 2025 21:42:08 +0300
Subject: [PATCH] [GitHub] Bump clang-tidy version to 21th in CI

---
 .github/workflows/pr-code-lint.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/pr-code-lint.yml b/.github/workflows/pr-code-lint.yml
index bc70933147bd2..3efd75471a317 100644
--- a/.github/workflows/pr-code-lint.yml
+++ b/.github/workflows/pr-code-lint.yml
@@ -47,10 +47,13 @@ jobs:
           echo "Changed files:"
           echo "$CHANGED_FILES"
 
+      # The clang tidy version should always be upgraded to the first version
+      # of a release cycle (x.1.0) or the last version of a release cycle, or
+      # if there have been relevant clang-format backports.
       - name: Install clang-tidy
         uses: aminya/setup-cpp at 17c11551771948abc5752bbf3183482567c7caf0 # v1.1.1
         with:
-          clang-tidy: 20.1.8
+          clang-tidy: 21.1.0
       
       - name: Setup Python env
         uses: actions/setup-python at 42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0