Update System.Memory version (#43515)

* Update System.Memory version

This should automatically update System.Numerics.Vectors, which is needed by the MSBuild team to add a new dependency on System.Text.Json, which is used in adding support for solution filter files in MSBuild.

* Update System.Buffers version

System.Memory depends on it being updated.

eng/Versions.props

@@ -186,13 +186,13 @@
     <RoslynOptProfRunSettingsGeneratorVersion>1.0.0-beta3.19057.1</RoslynOptProfRunSettingsGeneratorVersion>
     <RoslynMicrosoftVisualStudioExtensionManagerVersion>0.0.4</RoslynMicrosoftVisualStudioExtensionManagerVersion>
     <SourceBrowserVersion>1.0.21</SourceBrowserVersion>
-    <SystemBuffersVersion>4.5.0</SystemBuffersVersion>
+    <SystemBuffersVersion>4.5.1</SystemBuffersVersion>
     <SystemComponentModelCompositionVersion>4.5.0</SystemComponentModelCompositionVersion>
     <SystemDrawingCommonVersion>4.5.0</SystemDrawingCommonVersion>
     <SystemIOFileSystemVersion>4.3.0</SystemIOFileSystemVersion>
     <SystemIOFileSystemPrimitivesVersion>4.3.0</SystemIOFileSystemPrimitivesVersion>
     <SystemIOPipesAccessControlVersion>4.5.1</SystemIOPipesAccessControlVersion>
-    <SystemMemoryVersion>4.5.3</SystemMemoryVersion>
+    <SystemMemoryVersion>4.5.4</SystemMemoryVersion>
     <SystemRuntimeCompilerServicesUnsafeVersion>4.7.0</SystemRuntimeCompilerServicesUnsafeVersion>
     <SystemRuntimeLoaderVersion>4.3.0</SystemRuntimeLoaderVersion>
     <SystemTextEncodingCodePagesVersion>4.5.1</SystemTextEncodingCodePagesVersion>