[Java SDK] Release 2.1.2

[SinchSDKTeam]

What's Changed

Build

• [dependency] Bump jackson.version to 2.21.5 to solve @JsonView bypass vulnerabilities in jackson-databind (CVE-2026-59889 and GHSA-mhm7-754m-9p8w).
• [dependency] Bump httpclient5.version to 5.6.2 to solve a denial-of-service vulnerability in the transitive httpcore5 dependency (CVE-2026-54399).

[#2]

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