[release] Core stable release 1.12.0 updates (#6269)

Directory.Packages.props

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
-    <OTelLatestStableVer>1.11.2</OTelLatestStableVer>
+    <OTelLatestStableVer>1.12.0</OTelLatestStableVer>
 
     <!--
         This is typically the latest annual release of .NET. Use this wherever

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/CHANGELOG.md

@@ -7,6 +7,9 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+* Updated OpenTelemetry core component version(s) to `1.12.0`.
+  ([#6269](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6269))
+
 ## 1.11.2-beta.1
 
 Released 2025-Mar-05

src/OpenTelemetry.Exporter.Prometheus.HttpListener/CHANGELOG.md

@@ -7,6 +7,9 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+* Updated OpenTelemetry core component version(s) to `1.12.0`.
+  ([#6269](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6269))
+
 ## 1.11.2-beta.1
 
 Released 2025-Mar-05

src/OpenTelemetry.Shims.OpenTracing/CHANGELOG.md

@@ -6,6 +6,9 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+* Updated OpenTelemetry core component version(s) to `1.12.0`.
+  ([#6269](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6269))
+
 ## 1.11.2-beta.1
 
 Released 2025-Mar-05