Update instrumentisto/restic Docker tag to v0.16.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
instrumentisto/restic	stage	patch	0.16.2-r2 -> 0.16.4-r2

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Release Notes

instrumentisto/restic-docker-image (instrumentisto/restic)

### [`v0.16.4`](https://togithub.com/instrumentisto/restic-docker-image/blob/HEAD/CHANGELOG.md#0164-r2--2024-06-21) [0.16.4-r2]: /../../tree/0.16.4-r2 [Diff](/../../compare/0.16.4-r1...0.16.4-r2) ##### Security updated - \[Alpine Linux] 3.20.1: [docker-library/official-images@`9434c63`](https://togithub.com/docker-library/official-images/commit/9434c6383adc38dd26c6c1b098bed1981a6d9e7f) ### [`v0.16.3`](https://togithub.com/instrumentisto/restic-docker-image/blob/HEAD/CHANGELOG.md#0163-r1--2024-01-29) [0.16.3-r1]: /../../tree/0.16.3-r1 [Diff](/../../compare/0.16.3-r0...0.16.3-r1) ##### Security updated - \[Alpine Linux] 3.19.1: [docker-library/official-images@`a5a02e0`](https://togithub.com/docker-library/official-images/commit/a5a02e00e489cfaa9dc8056755cd00abe7d0f646)

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