build: niv advisory-db: update ca9497a4 -> dd7d3d72

## Changelog for advisory-db:
Branch: main
Commits: [rustsec/advisory-db@ca9497a4...dd7d3d72](rustsec/advisory-db@ca9497a...dd7d3d7)

* [`94bde4a3`](rustsec/advisory-db@94bde4a) Brotli CVE-2020-8927 redux ([RustSec/advisory-db⁠#1127](http://r.duckduckgo.com/l/?uddg=https://github.com/RustSec/advisory-db/issues/1127))
* [`32b107c4`](rustsec/advisory-db@32b107c) Assigned RUSTSEC-2021-0131 to brotli-sys ([RustSec/advisory-db⁠#1128](http://r.duckduckgo.com/l/?uddg=https://github.com/RustSec/advisory-db/issues/1128))
* [`dc5ced11`](rustsec/advisory-db@dc5ced1) CVE-2020-8927 for compu-brotli-sys ([RustSec/advisory-db⁠#1129](http://r.duckduckgo.com/l/?uddg=https://github.com/RustSec/advisory-db/issues/1129))
* [`dd7d3d72`](rustsec/advisory-db@dd7d3d7) Assigned RUSTSEC-2021-0132 to compu-brotli-sys ([RustSec/advisory-db⁠#1130](http://r.duckduckgo.com/l/?uddg=https://github.com/RustSec/advisory-db/issues/1130))

nix/sources.json

@@ -6,10 +6,10 @@
         "homepage": "https://rustsec.org",
         "owner": "RustSec",
         "repo": "advisory-db",
-        "rev": "ca9497a45b41e407cd090853cee09b09fd746af7",
-        "sha256": "14800mnir7nwqb5bk3nq7gkmwhnd6dhmjngs4n5cr8hq0ibfgrx7",
+        "rev": "dd7d3d726a862a1eccf8d8a40c41f8eeafc69243",
+        "sha256": "0cq9gqhvi7146ibbsfd1nid8wfi8r8vj6p90sz6m9pnck2cyyn1f",
         "type": "tarball",
-        "url": "https://github.com/RustSec/advisory-db/archive/ca9497a45b41e407cd090853cee09b09fd746af7.tar.gz",
+        "url": "https://github.com/RustSec/advisory-db/archive/dd7d3d726a862a1eccf8d8a40c41f8eeafc69243.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "agent-rs": {