JS: update change note.

Author: Napalys

javascript/ql/lib/change-notes/2025-06-20-execa.md

@@ -1,4 +1,4 @@
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 category: minorAnalysis
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-* The model for the `execa` library has been promoted from experimental to stable.
+* Enhanced modeling for the `execa` library, adding support for command execution methods `execaCommand`, `execaCommandSync`, `$`, and `$.sync`, as well as file system operations through `inputFile`, `pipeStdout`, `pipeAll`, and `pipeStderr`.