CI: install gnudiff and enable `Test_diffmode` on macos-14 runner again (#14056)

Commit: 
https://github.com/vim/vim/commit/72a1f45e9324f7e3b668b25cb18d2499df94720e
Author: Linda_pp <[email protected]>
Date:   Tue Feb 20 04:55:55 2024 +0900

    CI: install gnudiff and enable `Test_diffmode` on macos-14 runner again 
(https://github.com/vim/vim/issues/14056)
    
    Signed-off-by: rhysd <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 677630baa..a641ef563 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -373,6 +373,11 @@ jobs:
           "${SRCDIR}"/vim -u NONE -i NONE --not-a-term -esNX -V1 -S 
ci/if_ver-1.vim -c quit
           "${SRCDIR}"/vim -u NONE -i NONE --not-a-term -esNX -V1 -S 
ci/if_ver-2.vim -c quit
 
+      - name: Install packages for testing
+        run: |
+          # Apple diff is broken. Use GNU diff instead. See #14032.
+          brew install diffutils
+
       - name: Test
         timeout-minutes: 20
         run: |

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