chore: bump version to 1.0.81

Issue #102 fixes:
- sparkline location <xne:sqref> now follows sheet rename
- chart Add deferred props no longer report spurious unsupported_property

Author: goworm

src/officecli/officecli.csproj

@@ -5,7 +5,7 @@
     <TargetFramework>net10.0</TargetFramework>
     <RootNamespace>OfficeCli</RootNamespace>
     <AssemblyName>officecli</AssemblyName>
-    <Version>1.0.80</Version>
+    <Version>1.0.81</Version>
     <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
     <PublishSingleFile>true</PublishSingleFile>
     <SelfContained>true</SelfContained>