[ci] Update exist-xqts-runner to 2.0.0-RC4

[line-o]

Description:

Bumps the exist-xqts-runner_2.13 dependency in exist-xqts/pom.xml from 2.0.0-RC3 to 2.0.0-RC4.

RC4 includes the fix for the runner's nondeterministic JUnit output: RC3 could serialize a test set's result file while cases were still pending and rewrite it repeatedly mid-run, so each run recorded a slightly different subset of test cases (~40 tests of variance between runs of the same commit). That variance showed up as noise in the XQTS comparison step and triggered its recording-drift warning. With RC4, each test set is serialized exactly once after all of its cases complete — two full local runs against the same commit produced identical recorded test sets (0 presence diffs across 31,752 cases).

RC4 is published to the eXist-db GitHub Packages Maven repository, which CI already resolves via the maven-github-settings action and the github-xqts-runner repository declared in exist-parent.

Reference:

• [BUG] JUnit output nondeterministically omits test cases — same build, back-to-back runs recorded 31,213 vs 31,253 tests exist-xqts-runner#74 (root cause analysis)
• [bugfix] Deterministic JUnit output: serialize test sets from parsed ground truth exist-xqts-runner#76 (the fix, released in 2.0.0-RC4)

Type of tests:

No code changes — dependency version bump only. Verified locally that 2.0.0-RC4 resolves from GitHub Packages; the XQTS CI workflow on this PR exercises the new runner end-to-end.

🤖 Generated with Claude Code

https://claude.ai/code/session_01XqsCRdPehXB5zK1xcNFKEo

[github-actions]

📊 XQTS result comparison

Comparison of this run against develop.

Warning

Runner JAR build SHA or sha256 differs between the previous and current XQTS runs. Test deltas may include runner-side effects unrelated to this PR. See #6326.

Warning

519 test cases were recorded in only one of the two runs (0 only in the previous run, 519 only in the current run). The runner's JUnit output is not fully deterministic (see eXist-db/exist-xqts-runner#74), so totals and per-category deltas include recording noise; the newly passing/failing lists count only tests recorded in both runs.

Metric	develop	this run	Change
🟢 Passed	28,715 (91.75%)	28,845 (90.66%)	+130 (-1.09 pp)
🔴 Failures	1,560	1,569	+9
🔴 Errors	133	134	+1
🔴 Skipped	888	1,267	+379
🧪 Total tests	31,296	31,815	+519

Relative to develop: 0 newly passing, 1 newly failing, 0 new errors, 0 newly skipped — counting only tests recorded in both runs whose outcome changed.

🔴 Newly failing tests (1)

• Constr-inscope-2 (was passing)

⚪ Recorded only in this run (519)

• xs-dateTimeStamp-4 (skipped)
• xs-dateTimeStamp-5 (skipped)
• xs-dateTimeStamp-2 (skipped)
• xs-dateTimeStamp-6 (skipped)
• xs-dateTimeStamp-3 (skipped)
• fn-load-xquery-module-910 (skipped)
• fn-load-xquery-module-915 (skipped)
• fn-load-xquery-module-912 (skipped)
• fn-load-xquery-module-909 (skipped)
• fn-load-xquery-module-911 (skipped)
• fn-load-xquery-module-914 (skipped)
• fn-load-xquery-module-913 (skipped)
• xs-double-005 (skipped)
• xs-double-002 (skipped)
• xs-double-003 (skipped)
• xs-double-004 (skipped)
• cbcl-schema-element-5 (skipped)
• schema-import-4 (skipped)
• modules-schema-context (skipped)
• schema-import-30 (skipped)
• qischema072-04 (skipped)
• cbcl-validated-schema-element-4 (skipped)
• qischema008 (skipped)
• schema-import-18 (skipped)
• schema-import-29 (skipped)
• substitution-001 (skipped)
• qischema265 (skipped)
• qischema063q02-err (skipped)
• qischema90612-err (skipped)
• substitution-030 (skipped)
• schema-import-3 (skipped)
• qischema004 (skipped)
• substitution-020 (skipped)
• schema-import-6 (skipped)
• cbcl-validated-schema-element-1 (skipped)
• qischema041 (skipped)
• qischema90061-err (skipped)
• qischema90008 (skipped)
• schema-import-19 (skipped)
• qischema030 (skipped)
• substitution-023 (skipped)
• substitution-005 (skipped)
• qischema062 (skipped)
• schema-import-12 (skipped)
• schema-import-23 (skipped)
• qischema90172-err (skipped)
• schema-import-20 (skipped)
• substitution-021 (skipped)
• qischema90051-err (skipped)
• qischema072-05 (skipped)
• … and 469 more

_{Runtime: 329.2s (-99.27s vs develop).}