Bump borgmatic from 1.6.2 to 1.6.3 in /base-fullbuild (#48)

Bumps [borgmatic](https://github.com/borgmatic-collective/borgmatic) from 1.6.2 to 1.6.3.
- [Release notes](https://github.com/borgmatic-collective/borgmatic/releases)
- [Changelog](https://github.com/borgmatic-collective/borgmatic/blob/master/NEWS)
- [Commits](https://github.com/borgmatic-collective/borgmatic/compare/1.6.2...1.6.3)

---
updated-dependencies:
- dependency-name: borgmatic
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

base-fullbuild/requirements.txt

@@ -1,3 +1,3 @@
 llfuse==1.4.2
 borgbackup==1.2.1
-borgmatic==1.6.2
+borgmatic==1.6.3