Merge main into lauterm/otel

Resolve stale CI action pins in favor of main's dependabot versions
(actions/checkout@v7, actions/cache@v6, Microsoft.NET.Test.Sdk 18.7.0).
Net content is identical to main.

Author: marklauter

.github/actions/setup-dotnet/action.yml

@@ -10,7 +10,7 @@ runs:
         global-json-file: global.json
 
     - name: Cache NuGet packages
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: ~/.nuget/packages
         key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj', 'Directory.Packages.props') }}

.github/workflows/dotnet.publish.yml

@@ -21,7 +21,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: ./.github/actions/setup-dotnet
 
     - name: Restore dependencies
@@ -39,7 +39,7 @@ jobs:
     permissions:
       contents: read
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: ./.github/actions/setup-dotnet
 
     - name: Resolve package version

.github/workflows/dotnet.tests.yml

@@ -19,7 +19,7 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: ./.github/actions/setup-dotnet
 
     - name: Verify formatting
@@ -31,7 +31,7 @@ jobs:
       matrix:
         configuration: [ Debug, Release ]
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: ./.github/actions/setup-dotnet
 
     - name: Restore dependencies

Directory.Packages.props

@@ -39,7 +39,7 @@
 		<PackageVersion Include="coverlet.collector" Version="10.0.1" />
 		<PackageVersion Include="coverlet.msbuild" Version="10.0.1" />
 		<PackageVersion Include="Microsoft.Extensions.TimeProvider.Testing" Version="10.7.0" />
-		<PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
+		<PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
 		<PackageVersion Include="xunit.v3" Version="3.2.2" />
 		<!-- Granular xunit.v3 libs for the shared arch-test base (a class library, not an executable test project) -->
 		<PackageVersion Include="xunit.v3.extensibility.core" Version="3.2.2" />