Update dependency org.apache.commons:commons-dbcp2 to v2.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.apache.commons:commons-dbcp2 (source)	2.9.0 -> 2.12.0

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[alanorth]

Many failures in tests:

Error:  Failures: 
Error:    AccessStatusServiceTest>AbstractUnitTest.initDatabase:80 Error initializing database: The DataSource is a null reference -- cannot continue.
Error:    DefaultAccessStatusHelperTest>AbstractUnitTest.initDatabase:80 Error initializing database: The DataSource is a null reference -- cannot continue.
Error:    DSpaceCSVTest>AbstractUnitTest.initDatabase:80 Error initializing database: The DataSource is a null reference -- cannot continue.
Error:    TikaTextExtractionFilterTest>AbstractUnitTest.initDatabase:80 Error initializing database: The DataSource is a null reference -- cannot continue.
Error:    RequestItemEmailNotifierTest>AbstractUnitTest.initDatabase:80 Error initializing database: The DataSource is a null reference -- cannot continue.
Error:    RequestItemHelpdeskStrategyTest>AbstractUnitTest.initDatabase:80 Error initializing database: The DataSource is a null reference -- cannot continue.
Error:    RequestItemSubmitterStrategyTest>AbstractUnitTest.initDatabase:80 Error initializing database: The DataSource is a null reference -- cannot continue.
...