[PATCH v4] github-ci: update macos jobs from macos-14

[Junio C Hamano <gitster@pobox.com>]

GitHub from <no-reply@github.com> address keeps sending

  Subject: [Action Required] macOS 14 hosted runner image is closing down

and suggests to update to either macos-latest (macos-26) or
macos-15.  Use macos-15 for two of the four osx-* jobs, and
macos-26 for the other two jobs.  Use explicit version number
"26" instead of "latest" so that we can more easily tell the
differences and similarities between github-ci and gitlab-ci
and compare their outcome on the same commit when needed.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

 * Hopefully this is the final iteration, and hopefully the later
   part of the proposed log message explains the reasoning behind
   the choice between latest and 26 well.

 .github/workflows/main.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7e5769f543..e8f744d069 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -326,10 +326,10 @@ jobs:
             pool: macos-15
           - jobname: osx-reftable
             cc: clang
-            pool: macos-latest
+            pool: macos-26
           - jobname: osx-gcc
             cc: gcc-13
-            pool: macos-latest
+            pool: macos-26
           - jobname: osx-meson
             cc: clang
             pool: macos-15

Range-diff against v3:
1:  428ed741e9 ! 1:  2378f810f0 github-ci: update macos jobs to macos-15
    @@ Commit message
     
         and suggests to update to either macos-latest (macos-26) or
         macos-15.  Use macos-15 for two of the four osx-* jobs, and
    -    macos-latest for the other two jobs, which is very similar to what
    -    .gitlab-ci does.
    -
    -    Because we do not care which exact version we are running, so
    -    request macos-latest instead of naming macos-26.  If there were a
    -    similar symbolic name for the oldest-but-still-supported version,
    -    we would use it instead of explicitly asking for macos-15, but
    -    because there does not appear to be any, request macos-15.  This
    -    would require us to update these two lines once every year, which
    -    is annoying but is manageable.
    +    macos-26 for the other two jobs.  Use explicit version number
    +    "26" instead of "latest" so that we can more easily tell the
    +    differences and similarities between github-ci and gitlab-ci
    +    and compare their outcome on the same commit when needed.
     
         Signed-off-by: Junio C Hamano <gitster@pobox.com>
     
      ## .github/workflows/main.yml ##
     @@ .github/workflows/main.yml: jobs:
    -         vector:
    -           - jobname: osx-clang
    -             cc: clang
    --            pool: macos-14
    -+            pool: macos-15
    +             pool: macos-15
                - jobname: osx-reftable
                  cc: clang
    --            pool: macos-14
    -+            pool: macos-latest
    +-            pool: macos-latest
    ++            pool: macos-26
                - jobname: osx-gcc
                  cc: gcc-13
    --            pool: macos-14
    -+            pool: macos-latest
    +-            pool: macos-latest
    ++            pool: macos-26
                - jobname: osx-meson
                  cc: clang
    --            pool: macos-14
    -+            pool: macos-15
    -     env:
    -       CC: ${{matrix.vector.cc}}
    -       CC_PACKAGE: ${{matrix.vector.cc_package}}
    +             pool: macos-15
-- 
2.56.0-321-ga7e4057184