[llvm] [Github] Use standard checkout for ABI test workflows (PR #158468)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/158468

These workflows are currently using a custom checkout action in llvm/actions. This does the same thing as actions/checkout, but incurs a maintenance cost that we have not really been paying. Switch over to the Github supported workflow so someone else is paying the maintenance cost.

>From 7be2616c3b299374bbcc8c9dbe395114e09a0887 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Sun, 14 Sep 2025 08:15:55 +0000
Subject: [PATCH] [Github] Use standard checkout for ABI test workflows

These workflows are currently using a custom checkout action in
llvm/actions. This does the same thing as actions/checkout, but incurs a
maintenance cost that we have not really been paying. Switch over to the
Github supported workflow so someone else is paying the maintenance
cost.
---
 .github/workflows/libclang-abi-tests.yml | 4 ++--
 .github/workflows/llvm-tests.yml         | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/libclang-abi-tests.yml b/.github/workflows/libclang-abi-tests.yml
index 3836cc56a7c22..53da0d51f5081 100644
--- a/.github/workflows/libclang-abi-tests.yml
+++ b/.github/workflows/libclang-abi-tests.yml
@@ -113,10 +113,10 @@ jobs:
           ./configure
           sudo make install
       - name: Download source code
-        uses: llvm/actions/get-llvm-project-src at main
+        uses: actions/checkout at 08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
           ref: ${{ matrix.ref }}
-          repo: ${{ matrix.repo }}
+          repository: ${{ matrix.repo }}
       - name: Configure
         run: |
           mkdir install
diff --git a/.github/workflows/llvm-tests.yml b/.github/workflows/llvm-tests.yml
index 52b486e7e62fc..d941b969183fa 100644
--- a/.github/workflows/llvm-tests.yml
+++ b/.github/workflows/llvm-tests.yml
@@ -101,10 +101,10 @@ jobs:
           ./configure
           sudo make install
       - name: Download source code
-        uses: llvm/actions/get-llvm-project-src at main
+        uses: actions/checkout at 08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
           ref: ${{ matrix.ref }}
-          repo: ${{ matrix.repo }}
+          repository: ${{ matrix.repo }}
       - name: Configure
         run: |
           mkdir install