update maintainer email address

Author: t-kalinowski

DESCRIPTION

@@ -4,7 +4,7 @@ Title: Interface to 'TensorFlow' Datasets
 Version: 2.17.0
 Authors@R: c(
   person("Tomasz", "Kalinowski", role = c("ctb", "cph", "cre"),
-         email = "tomasz[email protected]"),
+         email = "tomasz@posit.co"),
   person("Daniel", "Falbel", role = c("ctb", "cph"),
          email = "[email protected]"),
   person("JJ", "Allaire", role = c("aut", "cph"),