gnu: python-unpaddedbase64: Update to 2.1.0.

* gnu/packages/python-xyz.scm (python-unpaddedbase64): Update to 2.1.0.
[source]: Fetch from PyPi.
[arguments]: Replace 'check phase to run tests fetched upstream from
GitHub.
[native-inputs]: Add `python-pytest` and `tests` for fetching upstream
tests.
[home-page]: Update to GitHub project home.

Signed-off-by: Lars-Dominik Braun <lars@6xq.net>

gnu/packages/python-xyz.scm

@@ -24690,19 +24690,40 @@ (define-public python-frozendict
 (define-public python-unpaddedbase64
   (package
     (name "python-unpaddedbase64")
-    (version "1.1.0")
+    (version "2.1.0")
     (source
      (origin
-       (method git-fetch)
-       (uri (git-reference
-             (url "https://github.com/matrix-org/python-unpaddedbase64")
-             (commit (string-append "v" version))))
-       (file-name (git-file-name name version))
+       (method url-fetch)
+       (uri (pypi-uri "unpaddedbase64" version))
        (sha256
-        (base32
-         "0if3fjfxga0bwdq47v77fs9hrcqpmwdxry2i2a7pdqsp95258nxd"))))
+        (base32 "01ghlmw63fgslwj8j74vkpf1kqvr7a4agm6nyn89vqwx106ccwvj"))))
     (build-system python-build-system)
-    (home-page "https://pypi.org/project/unpaddedbase64/")
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (replace 'check
+           (lambda* (#:key inputs tests? #:allow-other-keys)
+             (when tests?
+               (copy-recursively (string-append
+                                  (assoc-ref inputs "tests") "/tests")
+                                 "tests")
+               (invoke "python" "-m" "pytest" "-vv")))))))
+    (native-inputs
+     `(("python-pytest" ,python-pytest)
+       ("tests"
+        ;; The release on pypi comes without tests.  We can't build from this
+        ;; checkout, though, because installation requires an invocation of
+        ;; poetry.
+        ,(origin
+           (method git-fetch)
+           (uri (git-reference
+                 (url "https://github.com/matrix-org/python-unpaddedbase64")
+                 (commit (string-append "v" version))))
+           (file-name (git-file-name name version))
+           (sha256
+            (base32
+             "1n6har8pxv0mqb96lanzihp1xf76aa17jw3977drb1fgz947pnmz"))))))
+    (home-page "https://github.com/matrix-org/python-unpaddedbase64")
     (synopsis "Encode and decode Base64 without “=” padding")
     (description
      "RFC 4648 specifies that Base64 should be padded to a multiple of 4 bytes