fix: remove unused fmt import and resolve non-constant format string …

[rockaxorb13]

Description

This pull request resolves a static analysis failure caused by non-constant format strings being passed into logrus.Warnf functions across the node and communicator modules.

Previously, error messages were wrapped in fmt.Sprintf before being passed to the logger, which violates Go 1.21 strict vet checks regarding dynamic format strings. This PR strips the redundant fmt.Sprintf wrappers, updates the format verbs to %v to safely handle error types, and removes the resulting orphaned fmt import.

Changes Made

• Updated node.go to utilize native logrus formatting for all warning logs.
• Updated communicator.go to utilize native logrus formatting.
• Removed the unused fmt package import from communicator.go to ensure clean binary compilation.

Testing

• Verified successful compilation via go build ./... with zero warnings.