Fix DeepSource issues detected for Release V0.6.0

[edwardmack]

Task summary

During merge of development into main for release v0.6.0, DeepSource analysis detected the following issues:

• Unused code in dot/network/host.go starting at line 228
• Return of nil value detected in lib/scale/encode.go at line 128
• Shadow of builtin detected in dot/rpc/service.go at line 94
• Function call made to an unsafe package in dot/network/notifications.go at line 32
• Audit the random number generation source (rand) in:
  • lib/trie/test_utils.go line 42
  • dot/state/test_helpers.go line 64
  • dot/network/utils.go line 71
  • dot/network/connmgr.go line 166
• Empty body in an if or else branch in dot/rpc/modules/grandpa.go line 80

Specification reference

• see https://deepsource.io/gh/ChainSafe/gossamer/run/52c1d515-ffe8-4cf8-a9f0-324143e289cf/go/ for details.

Other information and links

[github-actions]

🎉 This issue has been resolved in version 0.6.0 🎉

The release is available on GitHub release

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