[jfx17u] RFR: 8301009: Update libxml2 to 2.10.3

[Johan Vos]

8301009: Update libxml2 to 2.10.3
Reviewed-by: kcr, sykora

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Commit messages:
 - 8301009: Update libxml2 to 2.10.3

Changes: https://git.openjdk.org/jfx17u/pull/132/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=132&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301009
  Stats: 6301 lines in 80 files changed: 1128 ins; 4562 del; 611 mod
  Patch: https://git.openjdk.org/jfx17u/pull/132.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u.git pull/132/head:pull/132

PR: https://git.openjdk.org/jfx17u/pull/132