ci: allow Dependabot to open up to 2 PRs

Apparently version updates aren't always disabled on old forks,
which leads to new PRs opened there. To somewhat mitigate the
issue let's limit the number of PRs Dependabot can create.

It was reported in https://github.com/yuwata/systemd/pull/2#issuecomment-967737195

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 123014908bebbfb7ecfa1d15daaceb272fabe05b..c87da6a802e5d199af5a395ae48c442fd8bbaabd 100644 (file)
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -4,3 +4,4 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+    open-pull-requests-limit: 2