Bean parameter could not be found when migrating spring boot

I'm migrating services from spring boot 1.5 to spring boot 2.1 and I'm getting an error during this process. I have the following class for configuring my spring beans:

@Configuration
public class CompanyTransactionConfiguration {
    public CompanyTransactionConfiguration() {
    }

    @Bean
    public TransactionTaskRunner transactionTaskRunner(PlatformTransactionManager transactionManager) {
        return new TransactionTaskRunnerImpl(this.readWriteTransactionTemplate(transactionManager), this.readOnlyTransactionTemplate(transactionManager), this.newReadWriteTransactionTemplate(transactionManager));
    }
}

And, of course, a test class to check that everything work as expected:

@RunWith(SpringRunner.class)
public class ReferrerActivityRepositoryIT extends AbstractDomainIT {

    @Autowired
    private ReferrerActivityRepository referrerActivityRepository;

    @Autowired
    private TransactionTaskRunner transactionTaskRunner;

    ...
}

The issue is that this test was working fine after I changed my dependencies to a newer spring boot version (2.1), but now I'm getting the following error:

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 0 of method transactionTaskRunner in com.company.core.server.config.CompanyTransactionConfiguration required a bean of type 'org.springframework.transaction.PlatformTransactionManager' that could not be found.

The following candidates were found but could not be injected:
    - Bean method 'transactionManager' in 'DataSourceTransactionManagerAutoConfiguration.DataSourceTransactionManagerConfiguration' not loaded because @ConditionalOnSingleCandidate (types: javax.sql.DataSource; SearchStrategy: all) did not find any beans
    - Bean method 'kafkaTransactionManager' in 'KafkaAutoConfiguration' not loaded because @ConditionalOnProperty (spring.kafka.producer.transaction-id-prefix) did not find property 'spring.kafka.producer.transaction-id-prefix' 

...


Action:

Consider revisiting the entries above or defining a bean of type 'org.springframework.transaction.PlatformTransactionManager' in your configuration.

I don't know what is going on, maybe I need to add another dependency because of changes in spring boot or change my application.properties file. The question is why is this happening? What should I change to get this working?

Thanks!