RFR: forge: double time-span for recent commit comments for GitLab

[Erik Helin]

Hi all,

please review this patch that increases the time span for fetching recent commit comments for a GitLab repository from `2` to `4` days. This ensures that the bots have some margin to fetch commit comments made prior to a weekend (in the unlikely case that the bots would be down over the weekend).

Testing:
- [x] `make test` passes on Linux x64

Thanks,
Erik

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Commit messages:
 - forge: double time-span for recent commit comments for GitLab

Changes: https://git.openjdk.java.net/skara/pull/1014/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1014&range=00
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/1014.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1014/head:pull/1014

PR: https://git.openjdk.java.net/skara/pull/1014