Version bump 4.5.0 for stable release line

[Copilot]

Why this PR?

Prepares the stable 4.5.0 release by updating package version metadata on main.
This aligns all published Feature Management packages to the same new stable version.

Visible Changes

• Package version metadata
  • Updated release version properties in all three shipping package projects:
    • src/Microsoft.FeatureManagement/Microsoft.FeatureManagement.csproj
    • src/Microsoft.FeatureManagement.AspNetCore/Microsoft.FeatureManagement.AspNetCore.csproj
    • src/Microsoft.FeatureManagement.Telemetry.ApplicationInsights/Microsoft.FeatureManagement.Telemetry.ApplicationInsights.csproj
  • Version change: 4.4.0 → 4.5.0 (MajorVersion=4, MinorVersion=5, PatchVersion=0).

<PropertyGroup>
  <MajorVersion>4</MajorVersion>
  <MinorVersion>5</MinorVersion>
  <PatchVersion>0</PatchVersion>
</PropertyGroup>

Original prompt

Please create a version bump PR for version 4.5.0 targeting the main branch.