[llvm] [Github] Bump formatting/tools container to 23.1.0 (PR #218815)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/218815

Now that 23.1.0 has been released, we should update the container to ensure we're using the latest released version of the tooling.

>From 328c0d1e693ac3f8350a31867fa1717aaae0560b Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Wed, 26 Aug 2026 00:55:54 +0000
Subject: [PATCH] [Github] Bump formatting/tools container to 23.1.0

Now that 23.1.0 has been released, we should update the container to
ensure we're using the latest released version of the tooling.
---
 .../workflows/containers/github-action-ci-tooling/Dockerfile  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/containers/github-action-ci-tooling/Dockerfile b/.github/workflows/containers/github-action-ci-tooling/Dockerfile
index 6ad9085bcc373..8791643331e89 100644
--- a/.github/workflows/containers/github-action-ci-tooling/Dockerfile
+++ b/.github/workflows/containers/github-action-ci-tooling/Dockerfile
@@ -1,6 +1,6 @@
-ARG LLVM_VERSION=22.1.0
+ARG LLVM_VERSION=23.1.0
 # FIXME: Use "${LLVM_VERSION%%.*}" instead of "LLVM_VERSION_MAJOR" once we update runners to Ubuntu-26.04 with Buildah >= 1.37
-ARG LLVM_VERSION_MAJOR=22
+ARG LLVM_VERSION_MAJOR=23
 
 FROM docker.io/library/ubuntu:24.04 at sha256:c4a8d5503dfb2a3eb8ab5f807da5bc69a85730fb49b5cfca2330194ebcc41c7b AS llvm-downloader
 ARG LLVM_VERSION