Remove experimental flag from share replication feature

This patch removes the experimental flag from the tests related
to the share replication feature.

Partially-implements: bp graduate-share-replication-feature
Change-Id: I998154886a1c242359a31d1406ffed8dd6f42d52
Depends-On: Idf8af1c96df373fbcbb4024db490cb4dab42faf7
diff --git a/manila_tempest_tests/config.py b/manila_tempest_tests/config.py
index de5cf58..7f2be76 100644
--- a/manila_tempest_tests/config.py
+++ b/manila_tempest_tests/config.py
@@ -29,7 +29,7 @@
                help="The minimum api microversion is configured to be the "
                     "value of the minimum microversion supported by Manila."),
     cfg.StrOpt("max_api_microversion",
-               default="2.55",
+               default="2.56",
                help="The maximum api microversion is configured to be the "
                     "value of the latest microversion supported by Manila."),
     cfg.StrOpt("region",