Add a specific tag for pip pkg ci jobs on macos because of _clock_gettime...

Add a specific tag for pip pkg ci jobs on macos because of _clock_gettime missing symbol on older macOS (10.9).

It works on 10.15 (and presumably on all >= 10.12).
However 10.9 can continue to build with static libs (matio and deps) and build-run with dynamic libs.

.gitlab-ci.yml

@@ -828,7 +828,7 @@ test_macos_purepy_release: # take care to keep this variable consistent with the
       artifacts: true
   tags:
     - macos
-    - macos_pkg_tester
+    - macos_pip_pkg_tester
 
 test_macos_purepy_release_extra_pyver:
   variables: {JOB_PYTHON: 'python3.11'} # take care to keep this variable consistent with the version used in pkg_macos_purepy_release_extra_pyver
@@ -838,7 +838,7 @@ test_macos_purepy_release_extra_pyver:
       artifacts: true
   tags:
     - macos
-    - macos_pkg_tester
+    - macos_pip_pkg_tester
 
 test_nux_purepy_release:
   variables: {JOB_PYTHON: 'python3.9'}