nearcore 1.28.1

Validators need to update before 9th of September or else they will start missing blocks.

Note that the release will use 3 GB more memory.

Fixes:

• Improved shard cache for Trie nodes to put more nodes in memory.

CODE_COLOR: CODE_YELLOW_MAINNET
RELEASE_VERSION: 1.28.1
PROTOCOL_UPGRADE: FALSE
DATABASE_UPGRADE: FALSE
SECURITY_UPGRADE: FALSE