Bump rclone/rclone from 1.67.0 to 1.68.0 in /scheduler (#5914)

Bumps rclone/rclone from 1.67.0 to 1.68.0.

---
updated-dependencies:
- dependency-name: rclone/rclone
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

scheduler/Dockerfile.rclone

@@ -1,4 +1,4 @@
-FROM rclone/rclone:1.67.0 as builder
+FROM rclone/rclone:1.68.0 as builder
 
 RUN mkdir /licenses && wget -O /licenses/license.txt https://raw.githubusercontent.com/rclone/rclone/master/COPYING