lint: Re-enable CVE checker.

This reverts d7fcd9c5.

* guix/lint.scm (%network-dependent-checkers): Re-enable 'cve checker.

guix/lint.scm

@@ -1319,17 +1319,11 @@ (define %network-dependent-checkers
      (name        'github-url)
      (description "Suggest GitHub URLs")
      (check       check-github-url))
-
-   ;; FIXME: Commented out as a consequence of the XML CVE feed retirement:
-   ;; <https://nvd.nist.gov/General/News/XML-Vulnerability-Feed-Retirement-Phase-3>.
-   ;; Reinstate it once the JSON feed is supported.
-
- ;;   (lint-checker
- ;;     (name        'cve)
- ;;     (description "Check the Common Vulnerabilities and Exposures\
- ;; (CVE) database")
- ;;     (check       check-vulnerabilities))
-
+   (lint-checker
+     (name        'cve)
+     (description "Check the Common Vulnerabilities and Exposures\
+ (CVE) database")
+     (check       check-vulnerabilities))
    (lint-checker
      (name        'refresh)
      (description "Check the package for new upstream releases")