Bump base64 to 0.23.1

[martinfrances107]

Also fix deprecated function

for example

-            Scheme::Data(_, base64) => base64::decode(base64).map_err(Error::Base64),
+            Scheme::Data(_, base64) => STANDARD.decode(base64).map_err(Error::Base64),

[martinfrances107]

Error are internal test runner flaws