Update license header template to match year 2022 (#766)

[brenuart]

closes #766

[codecov]

Codecov Report

Merging #786 (7ba01c3) into main (b6a3cb6) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #786   +/-   ##
=========================================
  Coverage     70.79%   70.79%           
  Complexity     1248     1248           
=========================================
  Files           167      167           
  Lines          4784     4784           
  Branches        493      493           
=========================================
  Hits           3387     3387           
  Misses         1151     1151           
  Partials        246      246           

Impacted Files	Coverage Δ
.../java/net/logstash/logback/CachingAbbreviator.java	100.00% <ø> (ø)
.../net/logstash/logback/LogstashAccessFormatter.java	58.67% <ø> (ø)
...n/java/net/logstash/logback/LogstashFormatter.java	57.92% <ø> (ø)
...ain/java/net/logstash/logback/NullAbbreviator.java	100.00% <ø> (ø)
...ck/appender/AbstractLogstashTcpSocketAppender.java	69.74% <ø> (ø)
...ck/appender/AbstractLogstashUdpSocketAppender.java	0.00% <ø> (ø)
...ck/appender/AccessEventAsyncDisruptorAppender.java	0.00% <ø> (ø)
...stash/logback/appender/AsyncDisruptorAppender.java	78.21% <ø> (ø)
...ack/appender/DelegatingAsyncDisruptorAppender.java	88.88% <ø> (ø)
...k/appender/LoggingEventAsyncDisruptorAppender.java	37.50% <ø> (ø)
... and 157 more

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