gnu: nss: Update to 3.71.

This is made in an attempt to get rid of non-deterministic test failures,
namely:

  [  FAILED  ] TlsConnectDatagram13.AeadLimit

* gnu/packages/nss.scm (nss): Update comment about nss-certs.  Update to 3.71.
[phases]{check}: Update faketime date.
[inputs]{sqlite}: Use the regular version.
* gnu/packages/certs.scm (nss-certs): Inherit version and source from nss.

gnu/packages/certs.scm

@@ -128,18 +128,8 @@ that was originally contributed to Debian.")
 (define-public nss-certs
   (package
     (name "nss-certs")
-    (version "3.67")
-    (source (origin
-              (method url-fetch)
-              (uri (let ((version-with-underscores
-                          (string-join (string-split version #\.) "_")))
-                     (string-append
-                      "https://ftp.mozilla.org/pub/mozilla.org/security/nss/"
-                      "releases/NSS_" version-with-underscores "_RTM/src/"
-                      "nss-" version ".tar.gz")))
-              (sha256
-               (base32
-                "0zyfi27lbdz1bmk9dmsivcya4phx25rzlxqcnjab69yd928rlm7n"))))
+    (version (package-version nss))
+    (source (package-source nss))
     (build-system gnu-build-system)
     (outputs '("out"))
     (native-inputs