Reduce gerrit heap limit to 44g

We had been setting this to 48GB on java 8, but recent gerrit service
issues indicate that this may be too large for our current system on
java 11. In particular it appears the non heap portions of the jvm may
be in the ~8GB range leaving only about 5-6GB of usable system memory
for other activities like web servers, backups, and garbage collection.

Reduce this to 44GB to increase headroom to see if that helps us. Java
11 is reported to be much more efficient at garbage collecting so
hopefully that makes up the difference between lower memory and where we
were on java 8. As a side note we could revert back to java 8 as another
option.

Change-Id: Ie326aad2a9895098b484924a26c9257cd009d89e

inventory/service/host_vars/review-test.opendev.org.yaml

@@ -2,7 +2,7 @@ gerrit_replication: []
 gerrit_storyboard_url: https://storyboard.openstack.org
 gerrit_vhost_name: review-test.opendev.org
 gerrit_serverid: adf32efa-43c9-4163-b047-c4449d8997da
-gerrit_heap_limit: 48g
+gerrit_heap_limit: 44g
 gerrit_track_upstream: false
 letsencrypt_certs:
   review-test-opendev-org-main:

inventory/service/host_vars/review01.openstack.org.yaml

@@ -59,7 +59,7 @@ gerrit_storyboard_url: https://storyboard.openstack.org
 gerrit_vhost_name: review.opendev.org
 gerrit_serverid: 4a232e18-c5a9-48ee-94c0-e04e7cca6543
 gerrit_redirect_vhost: review.openstack.org
-gerrit_heap_limit: 48g
+gerrit_heap_limit: 44g
 letsencrypt_certs:
   review01-opendev-org-main:
     - review.opendev.org