ReleaseNotes: remove superseded MSYS2 runtime entries

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

ReleaseNotes.md

@@ -42,9 +42,7 @@ Git for Windows is distributed with other components yet, such as Bash, zlib, cu
 ### New Features
 
 * Comes with [MinTTY v3.7.8](https://github.com/mintty/mintty/releases/tag/3.7.8).
-* Comes with the MSYS2 runtime (Git for Windows flavor) based on [Cygwin v3.6.0](https://cygwin.com/pipermail/cygwin-announce/2025-March/012224.html).
 * Comes with [OpenSSH v10.0.P1](https://github.com/openssh/openssh-portable/releases/tag/V_10_0_P1).
-* Comes with the MSYS2 runtime (Git for Windows flavor) based on [Cygwin v3.6.1](https://cygwin.com/pipermail/cygwin-announce/2025-April/012266.html).
 * Comes with the MSYS2 runtime (Git for Windows flavor) based on [Cygwin v3.6.2](https://cygwin.com/pipermail/cygwin-announce/2025-May/012350.html).
 * Comes with [cURL v8.14.0](https://curl.se/changes.html#8_14_0).