gitlab-ci: add Catalina as OSX 15

[avtikhon]

Tarantool version:

OS version:

Bug description:

Steps to reproduce:

Optional (but very desirable):

• coredump
• backtrace
• netstat

[avtikhon]

Need fixes from #4885, even additionally the same:

/Users/tntmac04.tarantool.i/tnt/src/box/box.cc:1459:1: error: 'box_session_push' is missing exception specification '__attribute__((nothrow))' [-Werror,-Wmissing-exception-spec]
box_session_push(const char *data, const char *data_end)
^
                                                         __attribute__((nothrow))
/Users/tntmac04.tarantool.i/tnt/src/box/box.h:472:1: note: previous declaration is here
box_session_push(const char *data, const char *data_end);
^
1 error generated.

diff --git a/src/box/box.cc b/src/box/box.cc
index 8454299f8..43219545e 100644
--- a/src/box/box.cc
+++ b/src/box/box.cc
@@ -1455,7 +1455,7 @@ box_sequence_reset(uint32_t seq_id)
        return sequence_data_delete(seq_id);
 }
 
-int
+API_EXPORT int
 box_session_push(const char *data, const char *data_end)
 {
        struct session *session = current_session();