Bump DocumentFormat.OpenXml

Bumps [DocumentFormat.OpenXml](https://github.com/dotnet/Open-XML-SDK) from 2.20.0 to 3.1.1.
- [Release notes](https://github.com/dotnet/Open-XML-SDK/releases)
- [Changelog](https://github.com/dotnet/Open-XML-SDK/blob/main/CHANGELOG.md)
- [Commits](dotnet/Open-XML-SDK@v2.20.0...v3.1.1)

---
updated-dependencies:
- dependency-name: DocumentFormat.OpenXml
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

FSSHTTPWOPIInspector/Test/WOPIautomation/WOPIautomation/App.config

@@ -50,6 +50,10 @@
         <assemblyIdentity name="Microsoft.Office.Interop.Graph" publicKeyToken="71e9bce111e9429c" culture="neutral" />
         <bindingRedirect oldVersion="0.0.0.0-15.0.0.0" newVersion="15.0.0.0" />
       </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="DocumentFormat.OpenXml" publicKeyToken="8fb06cb64d019a17" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-3.1.1.0" newVersion="3.1.1.0" />
+      </dependentAssembly>
     </assemblyBinding>
   </runtime>
 </configuration>

FSSHTTPWOPIInspector/Test/WOPIautomation/WOPIautomation/WOPIautomation.csproj

@@ -42,8 +42,13 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="DocumentFormat.OpenXml, Version=2.20.0.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17, processorArchitecture=MSIL">
-      <HintPath>..\packages\DocumentFormat.OpenXml.2.20.0\lib\net46\DocumentFormat.OpenXml.dll</HintPath>
+    <Reference Include="DocumentFormat.OpenXml, Version=3.1.1.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17">
+      <HintPath>..\packages\DocumentFormat.OpenXml.3.1.1\lib\net46\DocumentFormat.OpenXml.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="DocumentFormat.OpenXml.Framework, Version=3.1.1.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17">
+      <HintPath>..\packages\DocumentFormat.OpenXml.Framework.3.1.1\lib\net46\DocumentFormat.OpenXml.Framework.dll</HintPath>
+      <Private>True</Private>
     </Reference>
     <Reference Include="Fiddler, Version=5.0.20194.41348, Culture=neutral, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>

FSSHTTPWOPIInspector/Test/WOPIautomation/WOPIautomation/packages.config

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.20.0" targetFramework="net461" />
+  <package id="DocumentFormat.OpenXml" version="3.1.1" targetFramework="net48" />
+  <package id="DocumentFormat.OpenXml.Framework" version="3.1.1" targetFramework="net48" />
   <package id="Microsoft.IdentityModel.Abstractions" version="8.2.1" targetFramework="net48" />
   <package id="Microsoft.IdentityModel.Logging" version="6.19.0" targetFramework="net461" />
   <package id="Microsoft.IdentityModel.Tokens" version="6.19.0" targetFramework="net461" />