chore(main): release core 28.4.0 (#4101)

🤖 I have created a release *beep* *boop*
---


##
[28.4.0](core-v28.3.0...core-v28.4.0)
(2025-06-02)


### Features

* **contract-verifier:** add Etherscan-like endpoints used for contract
verification
([#4096](#4096))
([3a28262](3a28262))


### Bug Fixes

* **api:** rollback finality-related api changes of 28.3.0
([#4105](#4105))
([1c797c1](1c797c1))
* deprecate submission obj in favor of data obj
([#4083](#4083))
([9ce873d](9ce873d))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

---------

Co-authored-by: zksync-era-bot <[email protected]>

Author: zksync-era-bot

.github/release-please/manifest.json

@@ -1,5 +1,5 @@
 {
-  "core": "28.3.0",
+  "core": "28.4.0",
   "prover": "21.1.0",
   "zkstack_cli": "0.1.2"
 }

core/CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## [28.4.0](https://github.com/matter-labs/zksync-era/compare/core-v28.3.0...core-v28.4.0) (2025-06-02)
+
+
+### Features
+
+* **contract-verifier:** add Etherscan-like endpoints used for contract verification ([#4096](https://github.com/matter-labs/zksync-era/issues/4096)) ([3a28262](https://github.com/matter-labs/zksync-era/commit/3a28262de32dd802891da857524d9c60837abea4))
+
+
+### Bug Fixes
+
+* **api:** rollback finality-related api changes of 28.3.0 ([#4105](https://github.com/matter-labs/zksync-era/issues/4105)) ([1c797c1](https://github.com/matter-labs/zksync-era/commit/1c797c1a392c930e9c48fcf39aea032b546632bd))
+* deprecate submission obj in favor of data obj ([#4083](https://github.com/matter-labs/zksync-era/issues/4083)) ([9ce873d](https://github.com/matter-labs/zksync-era/commit/9ce873d28e46858e3940aefac24746ac9d8fcd64))
+
 ## [28.3.0](https://github.com/matter-labs/zksync-era/compare/core-v28.2.1...core-v28.3.0) (2025-05-29)