[repo] Core release 1.9.0-alpha.1 updates (open-telemetry#1827)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Mikel Blanchard <[email protected]>

Author: github-actions[bot]

build/Common.props

@@ -40,7 +40,7 @@
     <MicrosoftPublicApiAnalyzersPkgVer>[3.11.0-beta1.23525.2]</MicrosoftPublicApiAnalyzersPkgVer>
     <MicrosoftSourceLinkGitHubPkgVer>[8.0.0,9.0)</MicrosoftSourceLinkGitHubPkgVer>
     <OpenTelemetryCoreLatestVersion>[1.8.1,2.0)</OpenTelemetryCoreLatestVersion>
-    <OpenTelemetryCoreLatestPrereleaseVersion>[1.8.0-rc.1]</OpenTelemetryCoreLatestPrereleaseVersion>
+    <OpenTelemetryCoreLatestPrereleaseVersion>[1.9.0-alpha.1]</OpenTelemetryCoreLatestPrereleaseVersion>
     <StackExchangeRedisPkgVer>[2.1.58,3.0)</StackExchangeRedisPkgVer>
     <CassandraCSharpDriverPkgVer>[3.16.0,4.0)</CassandraCSharpDriverPkgVer>
     <StyleCopAnalyzersPkgVer>[1.2.0-beta.507,2.0)</StyleCopAnalyzersPkgVer>