[jdk21u-dev] RFR: 8319124: Update XML Security for Java to 3.0.3 [v4]

[Goetz Lindenmaier]

> I backport this for parity with 21.0.3-oracle.
> 
> The patch applied clean (first commit).
> 
> I removed the strings from SignatureMethod.java as documented in the backport CSR.
> I did not change DOMSignatureMethod.java.
> 
> I skipped the changes to GenerationTest.java. The test passes.
> 
> **Update**: 
> I pushed a new commit that makes the four new test cases work.
> As proposed in the CSR, I use the plain strings instead of the constants defined in SignaturMethod.

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Merge branch 'openjdk:master' into goetz_backport_8319124
 - Make new test cases work anyways
 - Fix comment
 - Undo changes not suitable for 21
 - Backport 1c0bd81a10f97c752818163a573d5983c7e481ac

-------------

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/94/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/94/files/619eacc1..41beac9e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=94&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=94&range=02-03

  Stats: 5628 lines in 750 files changed: 2799 ins; 654 del; 2175 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/94.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/94/head:pull/94

PR: https://git.openjdk.org/jdk21u-dev/pull/94