remove timeframe from security.md (#3106)

We don't provide updates to reporters with the frequency specified.
Remove the guarantee.

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Author: Trott

locale/en/security.md

@@ -16,8 +16,7 @@ handling your submission.
 After the initial reply to your report, the security team will endeavor to keep
 you informed of the progress being made towards a fix and full announcement,
 and may ask for additional information or guidance surrounding the reported
-issue. These updates will be sent at least every five days; in practice, this
-is more likely to be every 24-48 hours.
+issue.
 
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