Use new file-based method to set step output in GitHub actions.

https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Author: sharpjs

CHANGES.md

@@ -4,10 +4,9 @@ This file documents all notable changes.
 Most lines should begin with one of these words:
 *Add*, *Fix*, *Update*, *Change*, *Deprecate*, *Remove*.
 
-<!--
 ## [Unreleased](https://github.com/sharpjs/Subatomix.Build.Versioning.Semantic/compare/release/1.0.1..HEAD)
-(none)
--->
+- Fix use of [deprecated](https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/)
+  `set-output` workflow command in GitHub Actions.
 
 ## [1.0.1](https://github.com/sharpjs/Subatomix.Build.Versioning.Semantic/compare/release/1.0.0..release/1.0.1)
 - Fix use of deprecated `buildCrossTargeting` package directory.

src/Subatomix.Build.Versioning.Semantic.targets

@@ -59,7 +59,10 @@
   <Target Name="PrintVersion">
     <Message Condition="$(SetAzurePipelinesBuildName)" Importance="high" Text="##vso[build.updatebuildnumber]$(Version)" />
     <Message Condition="$(SetTeamCityBuildNumber)"     Importance="high" Text="##teamcity[buildNumber '$(Version)']" />
-    <Message Condition="$(SetGitHubActionsVersion)"    Importance="high" Text="::set-output name=version::$(Version)"/>
+    <WriteLinesToFile
+      Condition="$(SetGitHubActionsVersion) And '$(GITHUB_OUTPUT)' != ''"
+      File="$(GITHUB_OUTPUT)"
+      Lines="version=$(Version)" />
   </Target>
 
   <!-- Actual stamp file generation target -->