update SPDX headers

[merobi-hub]

Signed-off-by: Michael Robinson merobi@gmail.com

Problem

The SPDX license headers that we added to the project last year are out of date now that it's 2023.

Solution

This updates the headers across the project with the current year, adding headers where needed.

Note: All database schema changes require discussion. Please link the issue for context.

Checklist

• You've signed-off your work
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• You've updated the CHANGELOG.md with details about your change under the "Unreleased" section (if relevant, depending on the change, this may not be necessary)
• You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• You've included a header in any source code files (if relevant)

[codecov]

Codecov Report

Merging #2353 (25adfe4) into main (9a481bd) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #2353   +/-   ##
=========================================
  Coverage     76.72%   76.72%           
  Complexity     1177     1177           
=========================================
  Files           222      222           
  Lines          5354     5354           
  Branches        429      429           
=========================================
  Hits           4108     4108           
  Misses          768      768           
  Partials        478      478           

Impacted Files	Coverage Δ
api/src/main/java/marquez/MarquezApp.java	66.23% <ø> (ø)
api/src/main/java/marquez/MarquezConfig.java	100.00% <ø> (ø)
api/src/main/java/marquez/MarquezContext.java	85.89% <ø> (ø)
api/src/main/java/marquez/api/BaseResource.java	65.51% <ø> (ø)
...c/main/java/marquez/api/ColumnLineageResource.java	75.00% <ø> (ø)
api/src/main/java/marquez/api/DatasetResource.java	95.16% <ø> (ø)
api/src/main/java/marquez/api/JobResource.java	93.10% <ø> (ø)
...i/src/main/java/marquez/api/NamespaceResource.java	94.44% <ø> (ø)
...src/main/java/marquez/api/OpenLineageResource.java	85.18% <ø> (ø)
api/src/main/java/marquez/api/RunResource.java	86.66% <ø> (ø)
... and 196 more

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