Fix security, CI, and dependency issues in JDBC driver

[jrgemignani]

Note: This PR was created with AI tools and a human.

Security audit of the JDBC driver source code (16 main + 5 test Java files). The driver is a pure type-mapping layer (PGobject/agtype serialization only) with no query-building APIs, so it has minimal attack surface. No application-level vulnerabilities were found.

Update all dependencies to address critical vulnerabilities:

• postgresql 42.6.0 -> 42.7.5: fixes CVE-2024-1597 (Critical, CVSS 10.0: SQL injection via line comment generation in simple query mode)
• commons-text 1.10.0 -> 1.13.0: maintenance update (1.10.0 was not affected by CVE-2022-42889)
• antlr4 4.12.0 -> 4.13.2: bug fixes, Java 17+ improvements
• junit-jupiter 5.9.3 -> 5.11.4: maintenance update
• testcontainers 1.18.0 -> 1.20.4: stability improvements
• slf4j 2.0.7 -> 2.0.16: maintenance update
• Gradle wrapper 7.0 -> 8.5: Java 17/21 build support

Note: postgresql 42.7.7+ also fixes CVE-2025-49146 (High: auth bypass with channelBinding=require). Version 42.7.5 was chosen as a conservative update to fix the Critical CVE while minimizing risk from protocol changes in newer releases.

Fix root cause of CI test flakiness in BaseDockerizedTest:

• Add testcontainers wait strategy (Wait.forLogMessage) to ensure PostgreSQL is fully ready before attempting JDBC connection
• Add sslmode=disable to JDBC URL, required because postgresql 42.7.x attempts SSL negotiation by default and the AGE Docker image does not have SSL configured
• Remove silent exception swallowing (catch/println) on connection failure so test setup errors are reported immediately

modified: drivers/jdbc/gradle/wrapper/gradle-wrapper.properties
modified: drivers/jdbc/lib/build.gradle.kts
modified: drivers/jdbc/lib/src/test/java/org/apache/age/jdbc/BaseDockerizedTest.java

[jrgemignani]

This will have to be reworked.