Bump System.Drawing.Common in /tools/ResizeCodecampSpeakerImages

Bumps [System.Drawing.Common](https://github.com/dotnet/corefx) from 4.5.1 to 4.7.2.
- [Release notes](https://github.com/dotnet/corefx/releases)
- [Commits](https://github.com/dotnet/corefx/commits)

---
updated-dependencies:
- dependency-name: System.Drawing.Common
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

tools/ResizeCodecampSpeakerImages/ResizeCodecampSpeakerImages.csproj

@@ -12,7 +12,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="System.Drawing.Common" Version="4.5.1" />
+    <PackageReference Include="System.Drawing.Common" Version="4.7.2" />
   </ItemGroup>
 
 </Project>