[IcebergIO] Bump Java floor to 17 (prep for Iceberg 1.11.0)

Iceberg 1.11.0 is published as Java 17 bytecode (class file version 61);
Gradle module metadata declares "org.gradle.jvm.version": 17. The current
Java 11 floor on sdks/java/io/iceberg causes Iceberg 1.11.0 artifacts
to fail resolution. Raise the floor independently so the version bump
is a clean diff.

Iceberg 1.10.0 still resolves under Java 17 (10.0 only requires Java 11+).

Tracks #38925.

Author: peterphitran

CHANGES.md

@@ -82,6 +82,7 @@
 * (Python) Typehints of dataclass fields are honored during type inferences. To restore the behavior of fallback-to-any,
   use pipeline option `--exclude_infer_dataclass_field_type` ([#38797](https://github.com/apache/beam/issues/38797)).
   However fixing forward is recommended.
+* (Java) IcebergIO now requires Java 17 at runtime. This raises the floor in preparation for the Iceberg 1.11.0 upgrade, which is published as Java 17 bytecode. Pipelines using `Managed.read(ICEBERG)`/`Managed.write(ICEBERG)` must run on a Java 17+ JVM ([#38925](https://github.com/apache/beam/issues/38925)).
 
 ## Deprecations
 

sdks/java/io/iceberg/build.gradle

@@ -23,8 +23,8 @@ import java.util.stream.Collectors
 plugins { id 'org.apache.beam.module' }
 applyJavaNature(
         automaticModuleName: 'org.apache.beam.sdk.io.iceberg',
-        // iceberg ended support for Java 8 in 1.7.0
-        requireJavaVersion: JavaVersion.VERSION_11,
+        // iceberg ended support for Java 11 in 1.11.0
+        requireJavaVersion: JavaVersion.VERSION_17,
 )
 
 description = "Apache Beam :: SDKs :: Java :: IO :: Iceberg"