Bump org.apache.sling.servlets.post from 2.1.0 to 2.3.8 in /slingbucks

Bumps org.apache.sling.servlets.post from 2.1.0 to 2.3.8.

---
updated-dependencies:
- dependency-name: org.apache.sling:org.apache.sling.servlets.post
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
1 file changed