Bump Package validation baseline version to 9.7.0 (#6650)

* Initial plan

* Bump Package validation baseline version to 9.7.0

Co-authored-by: joperezr <13854455+joperezr@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: joperezr <13854455+joperezr@users.noreply.github.com>

Author: Copilot

eng/MSBuild/Packaging.targets

@@ -37,7 +37,7 @@
     <!-- https://learn.microsoft.com/dotnet/fundamentals/package-validation/overview -->
     <EnablePackageValidation>true</EnablePackageValidation>
 
-    <PackageValidationBaselineVersion Condition=" '$(Stage)' == 'normal' ">$(ApiCompatBaselineVersion)</PackageValidationBaselineVersion> 
+    <PackageValidationBaselineVersion Condition=" '$(Stage)' == 'normal' ">9.7.0</PackageValidationBaselineVersion> 
   </PropertyGroup>
 
   <!-- Verify that the minimum supported TFM is actually used. -->

eng/Versions.props

@@ -6,7 +6,6 @@
     <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
     <PreReleaseVersionIteration>1</PreReleaseVersionIteration>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
-    <ApiCompatBaselineVersion>9.6.0</ApiCompatBaselineVersion>
     <AssemblyVersion>$(MajorVersion).$(MinorVersion).0.0</AssemblyVersion>
     <!--
         When StabilizePackageVersion is set to 'true', this branch will produce stable outputs for 'Shipping' packages