Update alpine data source info in SOURCES.rst
+----------------+------------------------------------------------------------------------------------------------------+----------------------------------------------------+
|rust | https://github.com/RustSec/advisory-db |rust crates |
+----------------+------------------------------------------------------------------------------------------------------+----------------------------------------------------+
-|alpine | https://gitlab.alpinelinux.org/alpine/infra/alpine-secdb |alpine packages |
+|alpine | https://secdb.alpinelinux.org/ |alpine packages |
+----------------+------------------------------------------------------------------------------------------------------+----------------------------------------------------+
|archlinux | https://security.archlinux.org/json |arch packages |
+----------------+------------------------------------------------------------------------------------------------------+----------------------------------------------------+
