seastar: cherry-pick fmt 11 fixes

Update seastar submodule to:
https://github.com/ceph/seastar/commits/wip-seastar-fmt-11-fixes/

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

diff --git a/src/seastar b/src/seastar
index e7a2679235aeea4c9635e5202260204f0147a8c2..ba30b8c4d33ff22deff8daee5b080aaa7a7b4025 160000 (submodule)
--- a/src/seastar
+++ b/src/seastar
@@ -1 +1 @@
-Subproject commit e7a2679235aeea4c9635e5202260204f0147a8c2
+Subproject commit ba30b8c4d33ff22deff8daee5b080aaa7a7b4025