When using an older version of Neo4J (3.5) the latest changes in 4.3.2-1 chart cause startup errors

[stephenpope]

Describe the bug
When using Neo4J 3.5 as the base image then the latest changes in : https://github.com/neo4j-contrib/neo4j-helm/blob/master/templates/common-configmap.yaml#L24
.. cause Neo4J to error on startup.

To Reproduce
Steps to reproduce the behavior:

1. Install with these values

  acceptLicenseAgreement: "yes"
  authEnabled: false
  imageTag: "3.5"

Expected behavior
Neo4J starts up.

Error Logs

Starting Neo4j.
2021-09-07 13:58:52.945+0000 ERROR [o.n.s.CommunityBootstrapper] Failed to start Neo4j on unknown address. Invalid connector setting: dbms.connector.bolt.connection_keep_alive_for_requests
org.neo4j.graphdb.config.InvalidSettingException: Invalid connector setting: dbms.connector.bolt.connection_keep_alive_for_requests
	at org.neo4j.kernel.configuration.ConnectorValidator.lambda$null$1(ConnectorValidator.java:144)
	at java.util.Optional.orElseThrow(Optional.java:290)
	at org.neo4j.kernel.configuration.ConnectorValidator.lambda$validate$2(ConnectorValidator.java:143)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
	at java.util.HashMap$EntrySpliterator.forEachRemaining(HashMap.java:1699)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485)
	at org.neo4j.kernel.configuration.ConnectorValidator.validate(ConnectorValidator.java:141)
	at org.neo4j.kernel.configuration.IndividualSettingsValidator.validate(IndividualSettingsValidator.java:61)
	at org.neo4j.kernel.configuration.Config.migrateAndValidateAndUpdateSettings(Config.java:807)
	at org.neo4j.kernel.configuration.Config.<init>(Config.java:420)
	at org.neo4j.kernel.configuration.Config.<init>(Config.java:84)
	at org.neo4j.kernel.configuration.Config$Builder.build(Config.java:314)
	at org.neo4j.server.ServerBootstrapper.start(ServerBootstrapper.java:108)
	at org.neo4j.server.ServerBootstrapper.start(ServerBootstrapper.java:91)
	at org.neo4j.server.CommunityEntryPoint.main(CommunityEntryPoint.java:32)
2021-09-07 13:58:52.948+0000 INFO [o.n.s.CommunityBootstrapper] Neo4j Server shutdown initiated by request

Additional context
There is no way to bypass or work around this other than revert to 4.2.8-1