`url.PathEscape` unnecessarily encodes ! to %21, causing Matrix
homeservers to reject the request with 401. Replace %21 back to ! after
escaping.
Fixes#36012
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Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>