RFR: 8326099: GZIPOutputStream should use Deflater.getBytesRead() instead of Deflater.getTotalIn()

[Eirik Bjørsnøs]

Please review this cleanup PR in preparation for deprecating `Deflater.getTotalIn()` in JDK-8326096. 

This PR replaces `GZIPOutputStream.writeTrailer`'s call to `Deflater.getTotalIn()` with a call to `Deflater.getBytesRead()` followed by an explicit conversion to "modulo 2^32" (a cast to int) as described in RFC 1952:


 ISIZE (Input SIZE)
  This contains the size of the original (uncompressed) input
  data modulo 2^32.


Testing and verification: This should be trivially verifiable by code inspection. Nevertheless, I wrote a test which writes Integer.MAX_VALUE +1 bytes of uncompressed data and verified that the last four bytes written to the file was indeed as expected. (This test is not included in this PR because of its runtime and resource requirements).

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Commit messages:
 - Update copyright year
 - Update GZIPOutputStream.writeTrailer to use Deflater.getBytesRead() instead of Deflater.getTotalIn()

Changes: https://git.openjdk.org/jdk/pull/17900/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17900&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326099
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17900.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17900/head:pull/17900

PR: https://git.openjdk.org/jdk/pull/17900