fix(deps): update module github.com/peterbourgon/ff/v3 to v3.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/peterbourgon/ff/v3	v3.3.1 -> v3.4.0

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Release Notes

peterbourgon/ff (github.com/peterbourgon/ff/v3)

v3.4.0

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What's Changed

• JSON, TOML, YAML: support for nested config data by @​peterbourgon in https://github.com/peterbourgon/ff/pull/112
• ffcli: add DESCRIPTION with ShortHelp to DefaultUsageFunc by @​peterbourgon in https://github.com/peterbourgon/ff/pull/111

Full Changelog: https://github.com/peterbourgon/ff/compare/v3.3.2...v3.4.0

v3.3.2

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This release adds the WithFilesystem option, allowing users to specify a filesystem other than the default host FS for e.g. config files. Thanks to @​piotrkowalczuk and #​103 for the inspiration.

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