Set open pull requests limit to 100 for ecosystems

Increased the open pull requests limit for nuget and github-actions ecosystems.

Author: Gaardsholt

.github/dependabot.yml

@@ -9,6 +9,7 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "monthly"
+    open-pull-requests-limit: 100
   - package-ecosystem: "docker" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
@@ -17,3 +18,4 @@ updates:
     directory: "/"
     schedule:
       interval: "monthly"
+    open-pull-requests-limit: 100