Bump Ical.Net from 5.1.0 to 5.1.1

---
updated-dependencies:
- dependency-name: Ical.Net
  dependency-version: 5.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

eFormAPI/Plugins/BackendConfiguration.Pn/BackendConfiguration.Pn/BackendConfiguration.Pn.csproj

@@ -218,7 +218,7 @@
       <PackageReference Include="ChemicalsBase" Version="8.0.10" />
       <PackageReference Include="Google.Apis.Sheets.v4" Version="1.70.0.3819" />
       <PackageReference Include="HtmlToOpenXml.dll" Version="3.2.7" />
-      <PackageReference Include="Ical.Net" Version="5.1.0" />
+      <PackageReference Include="Ical.Net" Version="5.1.1" />
       <PackageReference Include="Microting.eForm" Version="9.0.56" />
       <PackageReference Include="Microting.EformAngularFrontendBase" Version="9.0.46" />
       <PackageReference Include="Microting.eFormApi.BasePn" Version="9.0.51" />