Enhanced connectivity handling and GitHub actions warnings

[x100111010]

Miner will pause when the connection is lost and resume when the connection is re-established:

• added a paused atomic boolean to the MinerManager to manage the miner's active state
• implemented pause and resume methods in the MinerManager to control mining based on the connection status
• modified the main loop to call pause when the connection is lost and resume when the connection is restored

Address GitHub actions warnings:

• updated tests.yaml Workflow:

• upgraded actions/checkout to v4

• replaced actions-rs/cargo@v1 with direct run commands for cargo operations

• added caching steps using actions/cache@v4

• updated deploy.yaml Workflow:

• upgraded actions/checkout to v4

• upgraded softprops/action-gh-release to v2