Bump org.apache.maven.plugins:maven-gpg-plugin from 3.0.1 to 3.1.0 #1032

Job	Run time
build-all	1m 6s
tests (scylla, -Pscylla-murmur -Dtest="*/diskstorage/cql/", murmur-diskstorage, 8)	14m 6s
tests (scylla, -Pscylla-murmur -Dtest="*/graphdb/cql/", murmur-graphdb, 8)	54m 47s
tests (scylla, -Pscylla-murmur -Dtest="*/hadoop/", murmur-hadoop, 8)	10m 56s
tests (scylla, -Pscylla-murmur -Dtest="*/core/cql/", murmur-core, 8)	3m 7s
tests (scylla, -Pscylla-murmur -Dtest="*/diskstorage/cql/", murmur-diskstorage, -Pjava-11, 11)	14m 1s
tests (scylla, -Pscylla-murmur -Dtest="*/graphdb/cql/", murmur-graphdb, -Pjava-11, 11)	54m 6s
tests (scylla, -Pscylla-murmur -Dtest="*/hadoop/", murmur-hadoop, -Pjava-11, 11)	10m 29s
tests (scylla, -Pscylla-murmur -Dtest="*/core/cql/", murmur-core, -Pjava-11, 11)	3m 22s
	2h 46m 0s

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