build: Release SDK v5.8.0

[github-actions]

Channels: current

🚀 New Features

• feat: hash PII (email/SMS) in SharedPreferences at rest (#2620)
• feat: SDK-4176: gate background threading behind remote feature flag (#2595)
• feat: SDK-4210: Standardize BACKGROUND_THREADING feature flag key naming (#2598)
• feat: SDK-4363: Turbine remote SDK feature flags and foreground refresh (#2612)

🐛 Bug Fixes

• bug: catch exception if opening a notification fails (#2508)
• Fix: a rare NPE from PermissionViewModel (#2504)
• fix: add retry for notification opened confirmation (#2606)
• fix: end initialization early if device storage is locked (#2520)

📦 Version

5.8.0

[claude]

LGTM — single-line SDK_VERSION bump from 5.4.2-beta1 to 5.8.0 for the release.

Extended reasoning...

Overview

This PR modifies a single line in OneSignalSDK/gradle.properties to bump SDK_VERSION from 5.4.2-beta1 to 5.8.0 in preparation for the v5.8.0 release. The actual feature/fix changes for 5.8.0 have already been merged via separate PRs listed in the description.

Security risks

None. This is a build-time string used to stamp the SDK version. It is not used in any auth, crypto, permission, or input-handling code path.

Level of scrutiny

Minimal. Version-bump release PRs are mechanical and the diff is a single line that exactly matches the announced 5.8.0 version. No logic changes are introduced here.

Other factors

No bugs were reported by the bug hunting system, no outstanding reviewer comments, and the change matches the standard pattern observed in recent release commits (e.g. commit 24ffbfa already contains the same bump locally).