Fixing tokenizers version (dotnet#7309)

* fixing tokenizers version

* fixes

Author: michaelgsharp

src/Microsoft.ML.Tokenizers.Data.Cl100kBase/Directory.Build.props

@@ -0,0 +1,3 @@
+<Project>
+  <Import Project="../Microsoft.ML.Tokenizers/Directory.Build.props" />
+</Project>

src/Microsoft.ML.Tokenizers.Data.Gpt2/Directory.Build.props

@@ -0,0 +1,3 @@
+<Project>
+  <Import Project="../Microsoft.ML.Tokenizers/Directory.Build.props" />
+</Project>

src/Microsoft.ML.Tokenizers.Data.O200kBase/Directory.Build.props

@@ -0,0 +1,3 @@
+<Project>
+  <Import Project="../Microsoft.ML.Tokenizers/Directory.Build.props" />
+</Project>

src/Microsoft.ML.Tokenizers.Data.P50kBase/Directory.Build.props

@@ -0,0 +1,3 @@
+<Project>
+  <Import Project="../Microsoft.ML.Tokenizers/Directory.Build.props" />
+</Project>

src/Microsoft.ML.Tokenizers.Data.R50kBase/Directory.Build.props

@@ -0,0 +1,3 @@
+<Project>
+  <Import Project="../Microsoft.ML.Tokenizers/Directory.Build.props" />
+</Project>

src/Microsoft.ML.Tokenizers/Directory.Build.props

@@ -0,0 +1,14 @@
+<Project>
+  <PropertyGroup>
+    <IsStableProject>true</IsStableProject>
+  </PropertyGroup>
+
+  <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.props, $(MSBuildThisFileDirectory)..))" />
+
+  <PropertyGroup>
+    <MajorVersion>$([MSBuild]::Subtract($(MajorVersion), 3))</MajorVersion>
+    <!-- Blank version for now for API compat -->
+    <PackageValidationBaselineVersion></PackageValidationBaselineVersion>
+  </PropertyGroup>
+
+</Project>