K8SPXC-742 regression with current docker packages

Due to https://bugzilla.redhat.com/show_bug.cgi?id=1870279
backups via garb failing randomly with "SSL_read(): Connection reset by peer errors" error coming from socat.

The problem could be fixed by migration to socat 1.7.4 in the docker image like it was done in perconalab/percona-xtradb-cluster-operator:k8spxc-742-pxc5.7

PXC image:

docker run -it --rm --entrypoint '' percona/percona-xtradb-cluster:5.7.35-31.53 bash
rpm -q socat
socat-1.7.3.3-2.el8.x86_64

PXC from the bug fix:

docker run -it --rm --entrypoint '' perconalab/percona-xtradb-cluster-operator:k8spxc-742-pxc5.7 bash
rpm -q socat
socat-1.7.4.1-1.el8.x86_64

Latest PXC image:

docker pull percona/percona-xtradb-cluster:5.7;docker run -it --rm --entrypoint '' percona/percona-xtradb-cluster:5.7 bash
rpm -q socat
socat-1.7.3.3-2.el8.x86_64