HTML encode issue titles in release notes tool

If someone reports an issue on a specific method, and that method is async
the compiler generates a name like `TypeName+<Method>`, but that looks
like an invalid HTML tag that will get hidden when rendered. Therefore, HTML
encode it, so it gets displayed correctly.

Also update the project to .NET 8, update packages and fix a few compiler warnings

Author: zivkan

NuGetReleaseTool/NuGetReleaseTool/GenerateReleaseNotesCommand/ReleaseNotesGenerator.cs

@@ -1,7 +1,7 @@
 using Octokit;
-using System.Collections.Generic;
 using System.Text;
 using System.Text.RegularExpressions;
+using System.Web;
 
 namespace NuGetReleaseTool.GenerateReleaseNotesCommand
 {
@@ -307,7 +307,7 @@ private static void OutputCommunityPullRequestsSection(
                     Dictionary<string, List<PullRequest>> pullRequestsByContributors = new();
                     foreach (var pullRequest in communityPullRequests)
                     {
-                        if (!pullRequestsByContributors.TryGetValue(pullRequest.User.Login, out List<PullRequest> pullRequests))
+                        if (!pullRequestsByContributors.TryGetValue(pullRequest.User.Login, out List<PullRequest>? pullRequests))
                         {
                             pullRequests = new List<PullRequest>();
                             pullRequestsByContributors.Add(pullRequest.User.Login, pullRequests);
@@ -357,7 +357,7 @@ private static void OutputSection(
 
                 foreach (var issue in issues)
                 {
-                    builder.AppendLine("* " + issue.Title + " - " + "[#" + issue.Number + "](" + issue.HtmlUrl + ")");
+                    builder.AppendLine("* " + HttpUtility.HtmlEncode(issue.Title) + " - " + "[#" + issue.Number + "](" + issue.HtmlUrl + ")");
                     builder.AppendLine();
                 }
             }

NuGetReleaseTool/NuGetReleaseTool/Helpers.cs

@@ -112,7 +112,7 @@ public static async Task<List<CommitWithDetails>> GetCommitDetails(GitHubClient
 
                 if (pullRequestbody == null)
                 {
-                    Console.WriteLine($"PR contains contains no body message: {commit?.PR?.Item2}");
+                    Console.WriteLine($"PR contains contains no body message: {commit.PR?.Item2}");
                 }
                 else
                 {

NuGetReleaseTool/NuGetReleaseTool/NuGetReleaseTool.csproj

@@ -2,14 +2,14 @@
 
 	<PropertyGroup>
 		<OutputType>Exe</OutputType>
-		<TargetFramework>net7.0</TargetFramework>
+		<TargetFramework>net8.0</TargetFramework>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="CommandLineParser" Version="2.7.82" />
+		<PackageReference Include="CommandLineParser" Version="2.9.1" />
 		<PackageReference Include="octokit" Version="11.0.1" />
-		<PackageReference Include="NuGet.Commands" Version="6.9.1" />
+		<PackageReference Include="NuGet.Commands" Version="6.11.1" />
 	</ItemGroup>
 </Project>