Remove year from license header

[xiazcy]

Summary

Removing year from license header.

Description

The newer source file headers no longer include a year, so we are removing it from ours. Year information is still included in the LICENSE file, so this wouldn't affect copyright.

Additional Reviewers

@birschick-bq @xiazcy @alexey-temnikov @kylepbit

[codecov-commenter]

Codecov Report

Merging #221 (dbc0a17) into develop (98b1f90) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #221   +/-   ##
========================================
  Coverage    67.53%   67.53%           
========================================
  Files          121      121           
  Lines         5874     5874           
  Branches       585      585           
========================================
  Hits          3967     3967           
  Misses        1556     1556           
  Partials       351      351           

Impacted Files	Coverage Δ
.../software/aws/neptune/NeptuneDatabaseMetadata.java	28.57% <ø> (ø)
.../main/java/software/aws/neptune/NeptuneDriver.java	56.00% <ø> (ø)
...va/software/aws/neptune/common/EmptyResultSet.java	0.00% <ø> (ø)
...are/aws/neptune/common/EmptyResultSetMetadata.java	0.00% <ø> (ø)
...e/aws/neptune/common/ResultSetInfoWithoutRows.java	100.00% <ø> (ø)
...neptune/common/gremlindatamodel/MetadataCache.java	30.18% <ø> (ø)
...gremlindatamodel/SchemaHelperGremlinDataModel.java	0.00% <ø> (ø)
...n/gremlindatamodel/resultset/GenericResultSet.java	33.33% <ø> (ø)
...emlindatamodel/resultset/ResultSetGetCatalogs.java	85.71% <ø> (ø)
...remlindatamodel/resultset/ResultSetGetColumns.java	0.00% <ø> (ø)
... and 111 more

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