Support Java 25 and Spark 4.1, raise minimum to Java 17

[porunov]

Modernizes TinkerPop 4.0 to build and run on Java 25 and upgrades the Spark OLAP integration to Spark 4.1. Because Spark 4 requires Java 17 as a minimum, the project-wide minimum Java version is raised from 11 to 17.

Java 25 support:

• Groovy 4.0.25 -> 4.0.32 (bundled ASM parses Java 25 bytecode)
• StringFactory: detect the Java 21+ lambda class name format ($$Lambda/)
• LambdaRestrictionStrategy: match "lambda" case-insensitively
• ImportGremlinPluginTest: account for Math.TAU added in Java 19
• gremlin-groovy: declare annotationProcessorPaths explicitly (JDK 23+ no longer runs classpath-discovered processors) and widen the javadoc groovy-stubs profile to all supported JDKs
• gremlin-console: apply the neo4j-gremlin --add-opens flags for JDK 17+

Dependency upgrades:

• Hadoop 3.4.2 -> 3.4.3 (uses the Subject.current()/callAs() replacement APIs, so hadoop-gremlin runs on Java 25)
• Spark 3.5.4 -> 4.1.2, which is Scala 2.13 only and the first Spark line to support Java 25. Switched spark-core_2.12 -> _2.13, ported the Scala 2.13 changes (JavaConversions -> CollectionConverters, WrappedArray -> immutable ArraySeq) and aligned Netty, jackson (via jackson-bom) and other transitive versions that Spark 4 requires
• Netty 4.1.125 -> 4.2.7 (required by Spark 4)

Java 17 baseline (breaking):

• enforcer requireJavaVersion [11,18) -> [17,26); compiler release 11 -> 17 (and gremlin-groovy/gremlin-annotations release 8 -> 17)
• build-test.yml: all jobs run on Java 17, plus a new Java 25 job; the Java 11 job is removed and coverage runs on the Java 17 job
• Dockerfiles and developer docs updated to Java 17

Validated with a full mvn clean install on both Java 17 and Java 25 (all JVM modules, including hadoop-gremlin and spark-gremlin).

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.13%. Comparing base (a28cd1f) to head (fc9d33a).
⚠️ Report is 161 commits behind head on master.

Files with missing lines	Patch %	Lines
...inkerpop/gremlin/structure/util/StringFactory.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3489      +/-   ##
============================================
- Coverage     76.35%   76.13%   -0.23%     
- Complexity    13424    13682     +258     
============================================
  Files          1012     1029      +17     
  Lines         60341    61923    +1582     
  Branches       7075     7231     +156     
============================================
+ Hits          46076    47146    +1070     
- Misses        11548    11881     +333     
- Partials       2717     2896     +179     

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