Update license year to 2023

[philsttr]

No description provided.

[codecov]

Codecov Report

Merging #971 (b0b2d8c) into main (568466b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #971   +/-   ##
=========================================
  Coverage     71.78%   71.78%           
  Complexity     1417     1417           
=========================================
  Files           177      177           
  Lines          5178     5178           
  Branches        534      534           
=========================================
  Hits           3717     3717           
  Misses         1197     1197           
  Partials        264      264           

Impacted Files	Coverage Δ
.../java/net/logstash/logback/CachingAbbreviator.java	0.00% <ø> (ø)
.../net/logstash/logback/LogstashAccessFormatter.java	57.72% <ø> (ø)
...n/java/net/logstash/logback/LogstashFormatter.java	52.42% <ø> (ø)
...ain/java/net/logstash/logback/NullAbbreviator.java	0.00% <ø> (ø)
...gstash/logback/abbreviator/CachingAbbreviator.java	100.00% <ø> (ø)
...ck/abbreviator/DefaultTargetLengthAbbreviator.java	92.00% <ø> (ø)
.../logstash/logback/abbreviator/NullAbbreviator.java	100.00% <ø> (ø)
...ck/appender/AbstractLogstashTcpSocketAppender.java	72.36% <ø> (ø)
...ck/appender/AbstractLogstashUdpSocketAppender.java	0.00% <ø> (ø)
...ck/appender/AccessEventAsyncDisruptorAppender.java	0.00% <ø> (ø)
... and 167 more