Update ChangeLog for version 6.0.0.rc3.

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+2024-02-21, Version 6.0.0.rc3
+       * Daemon: Two new metric types have been added: "up down counters" in
+         integer and floating point variants. Thanks to @octo. #4287
+       * OpenTelemetry plugin: This new plugin provides the ability to export
+         as well as receive metrics via OTLP. It supersedes the
+         *write_open_telemetry plugin*. Thanks to @octo. #4271
+       * Write Prometheus plugin: A possible deadlock due to a leaked mutex has
+         been fixed. Thanks to @octo. #4285
+       * Write Prometheus plugin: Bugs in the handling of metrics from multiple
+         resources as well as printing of metrics without labels have been
+         fixed. Thanks to @octo. #4284
+       * gpu_sysman plugin: Use real collectd metric functions unit tests.
+         Thanks to @eero-t. #4223
+       * memory plugin: The `system.linux.memory.available` metric has been
+         added. Thanks to @octo. #4275
+       * swap plugin: The `system.paging.faults` metric has been added. Thanks
+         to @octo. #4278
+
 2024-02-07, Version 6.0.0.rc2
        * Daemon: The `plugin_dispatch_metric_family()` function has been
          changed to handle metric families with zero metrics gracefully. Thanks