Bump version to 1.25 after creating branch for v18u4

Author: claudiamurialdo

dotnet/Directory.Build.props

@@ -3,7 +3,7 @@
 		<AssemblyVersion>11.0.0.0</AssemblyVersion>
 		<MajorFileVersion>1</MajorFileVersion>
 		<MajorFileVersion Condition="$(GIT_REF.EndsWith('beta'))">$([MSBuild]::Add($(MajorFileVersion), 100))</MajorFileVersion>
-		<MinorFileVersion>24</MinorFileVersion>
+		<MinorFileVersion>25</MinorFileVersion>
 		<PatchFileVersion Condition="'$(COMMIT_NUMBER)'!=''">$(COMMIT_NUMBER)</PatchFileVersion>
 		<PatchFileVersion Condition="'$(COMMIT_NUMBER)'==''">0</PatchFileVersion>
 		<FileVersion>$(MajorFileVersion).$(MinorFileVersion).$(PatchFileVersion)</FileVersion>