chore(doc): correct retention duration for semgrep artifacts

README.md

@@ -384,7 +384,7 @@ It is bound to the `test` stage, and uses the following variables:
 > - the `--metrics` option is set to `off`,
 > - the `--disable-version-check` option is set.
 
-In addition to a textual report in the console, this job produces the following reports, kept for one day:
+In addition to a textual report in the console, this job produces the following reports, kept for one week:
 
 | Report                                               | Format                                                                                       | Usage                                                                                                                                                                   |
 | ---------------------------------------------------- | -------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- |