Update EphemeralMongo to fix flaky tests with "Text file busy" on Ubuntu (#97)

Author: bkoelman

package-versions.props

@@ -7,7 +7,7 @@
     <!-- Non-published dependencies (these are safe to update, won't cause a breaking change) -->
     <BogusVersion>35.6.*</BogusVersion>
     <CoverletVersion>6.0.*</CoverletVersion>
-    <EphemeralMongoVersion>3.0.*</EphemeralMongoVersion>
+    <EphemeralMongoVersion>3.1.*</EphemeralMongoVersion>
     <FluentAssertionsVersion>7.2.*</FluentAssertionsVersion>
     <GitHubActionsTestLoggerVersion>2.4.*</GitHubActionsTestLoggerVersion>
     <InheritDocVersion>2.0.*</InheritDocVersion>