Update fredboat/lavalink Docker tag to v3.7.13

[renovate]

This PR contains the following updates:

Package	Update	Change
fredboat/lavalink	patch	3.7.12 → 3.7.13

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Release Notes

lavalink-devs/Lavalink (fredboat/lavalink)

v3.7.13

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What's Changed

[!CAUTION]
This is the last Lavalink v3 release, see: https://redirect.github.com/lavalink-devs/Lavalink/discussions/1100

• Updated Lavaplayer to 1.5.6
• Updated koe to 2.0.3-rc2 & use voice gateway v8 in #​1098

Full Changelog: lavalink-devs/Lavalink@3.7.12...3.7.13

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