fix: use non-greedy tag regex for .NET 10 compatibility

The TaggedLogLineMatcher regex used `.+` (greedy match) in the optional
tag group, which relied on backtracking to correctly parse tags. .NET 10
changed regex engine backtracking behaviour, causing the optional group
to be skipped entirely instead of backtracking to find the tag value.

Replace `Tag=.+` with `Tag=[^,]+` to match only non-comma characters,
avoiding the need for backtracking across comma boundaries.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: LeeCampbell

HdrHistogram/HistogramLogReader.cs

@@ -18,7 +18,7 @@ public sealed class HistogramLogReader : IDisposable, IHistogramLogV1Reader
         private static readonly Regex BaseTimeMatcher = new Regex(@"#\[BaseTime: (?<seconds>\d*\.\d{1,3}) ", RegexOptions.Compiled);
         //Content lines - format =  startTimestamp, intervalLength, maxTime, histogramPayload
         private static readonly Regex UntaggedLogLineMatcher = new Regex(@"(?<startTime>\d*\.\d*),(?<interval>\d*\.\d*),(?<max>\d*\.\d*),(?<payload>.*)", RegexOptions.Compiled);
-        private static readonly Regex TaggedLogLineMatcher = new Regex(@"((?<tag>Tag=.+),)?(?<startTime>\d*\.\d*),(?<interval>\d*\.\d*),(?<max>\d*\.\d*),(?<payload>.*)", RegexOptions.Compiled);
+        private static readonly Regex TaggedLogLineMatcher = new Regex(@"((?<tag>Tag=[^,]+),)?(?<startTime>\d*\.\d*),(?<interval>\d*\.\d*),(?<max>\d*\.\d*),(?<payload>.*)", RegexOptions.Compiled);
         private readonly TextReader _log;
         private double _startTimeInSeconds;