[Java SDK] Release 2.1.1

[SinchSDKTeam]

What's Changed

Build & CI

• [tech] Build across a Java version matrix (8, 11, 17, 21, 25) in GitHub Actions, replacing the single Java 21 build — unit tests run on 11, 17, 21, and 25, and artifacts are built on Java 8.
• [tech] e2e tests across a Java version matrix (8, 11, 17, 21, 25) in GitHub Actions, replacing the single Java 21 validation.
• [tech] Apply Spotless / Google Java Format per JDK via version-activated Maven profiles (spotless-jdk8, spotless-jdk11, spotless-jdk17, spotless-jdk21-plus), keeping formatting working across the whole matrix.
• [tech] Enable -Dnet.bytebuddy.experimental=true for Surefire so Mockito/ByteBuddy run on Java 25.
• [dependency] Bump maven-compiler-plugin to 3.13.0, Surefire and Failsafe to 3.5.6, and Mockito to 5.23.0.
• [dependency] Remove unused dependency on org.apache.maven:maven-model.
• [dependency] Bump jackson.version to 2.21.4 to solve a vulnerability in jackson-databind (CVE-2026-54513).

Documentation

• [doc] README: document the supported Java versions (8, 11, 17, 21, 25) with per-version badges and download links, replacing the generic "Java 8+" badge.

Tests

• [test] Remove DateUtilTest cases for unsupported timezone abbreviations (MST, EST😞 as of Java 25 the JDK no longer resolves legacy COMPAT timezone names (JDK-8325568).

[#2]

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