fix: remove port from bootstrap DNS

[lupino3]

This fixes a configuration parsing error.

Proposed Changes

This commit removes the port specification from the default AdGuard home bootstrap DNS.

The current configuration generates a parsing error:

2024/03/11 11:55:36 [error] Couldn't get logging settings from the configuration: yaml: unmarshal errors:
  line 3: cannot unmarshal !!str `1.1.1.1:53` into []string

This commit fixes the error and allows AdGuard home to keep parsing its configuration.

Related Issues

Fixes #499

[github-actions[bot]]

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