chore(release): update changelog and bump version to 2.1.2

[shumkov]

Issue being fixed or feature implemented

Release new Dash Platform version

What was done?

• Updated changelog
• Bumped packages version

How Has This Been Tested?

None

Breaking Changes

None

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[github-actions]

✅ gRPC Query Coverage Report

================================================================================
gRPC Query Coverage Report - NEW QUERIES ONLY
================================================================================

Total queries in proto: 47
Previously known queries: 47
New queries found: 0


================================================================================
Summary:
--------------------------------------------------------------------------------
No new queries found

Total known queries: 47
  - Implemented: 44
  - Not implemented: 2
  - Excluded: 1

Not implemented queries:
  - getConsensusParams
  - getTokenPreProgrammedDistributions

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch release_2.1.2

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[github-actions]

✅ DashSDKFFI.xcframework built for this PR.

• Workflow run: https://github.com/dashpay/platform/actions/runs/18841279526
• Artifacts: DashSDKFFI.xcframework (folder), DashSDKFFI.xcframework.zip, xc_checksum.txt

SwiftPM (host the zip at a stable URL, then use):

.binaryTarget(
  name: "DashSDKFFI",
  url: "https://your.cdn.example/DashSDKFFI.xcframework.zip",
  checksum: "91a46c65180a40ae00d17b622e82984cf4f4d24491d58b504e318eeee31b1dec"
)

Xcode manual integration:

• Download 'DashSDKFFI.xcframework' artifact from the run link above.
• Drag it into your app target (Frameworks, Libraries & Embedded Content) and set Embed & Sign.
• If using the Swift wrapper package, point its binaryTarget to the xcframework location or add the package and place the xcframework at the expected path.