MAINT: Update fmt-maven-plugin to 2.21.1. Should fix flaky tests.

pom.xml

src/main/java/org/caosdb/datetime/FragmentDateTime.java

src/main/java/org/caosdb/datetime/UTCDateTime.java

src/main/java/org/caosdb/server/CaosDBServer.java

src/main/java/org/caosdb/server/accessControl/Pam.java

...ava/org/caosdb/server/database/DatabaseAccessManager.java

.../backend/implementation/MySQL/DatabaseConnectionPool.java

.../database/backend/implementation/MySQL/DatabaseUtils.java

...abase/backend/implementation/MySQL/MySQLLogUserVisit.java

...er/database/backend/implementation/MySQL/Replacement.java

...se/backend/transaction/RetrieveFullEntityTransaction.java

...org/caosdb/server/database/misc/TransactionBenchmark.java

...in/java/org/caosdb/server/datatype/AbstractEnumValue.java

...main/java/org/caosdb/server/datatype/CollectionValue.java

src/main/java/org/caosdb/server/datatype/ReferenceValue.java

src/main/java/org/caosdb/server/grpc/AuthInterceptor.java

src/main/java/org/caosdb/server/grpc/GRPCServer.java

src/main/java/org/caosdb/server/query/Query.java

src/main/java/org/caosdb/server/query/ResultSetIterator.java

.../caosdb/server/resource/AbstractCaosDBServerResource.java