postgresql_10: 10.6 -> 10.7

See https://www.postgresql.org/about/news/1920/ for release information.

(cherry picked from commit a90cf49fa99d8625beac67eabe236eef25704755)

pkgs/servers/sql/postgresql/default.nix

···
   };
 
   postgresql_10 = self.callPackage generic {
-    version = "10.6";
+    version = "10.7";
     psqlSchema = "10.0"; # should be 10, but changing it is invasive
-    sha256 = "0jv26y3f10svrjxzsgqxg956c86b664azyk2wppzpa5x11pjga38";
+    sha256 = "1piyfcrcqscjhnnwn91kdvr764s7d0qz4lgygf9bl6qc71ji1vdz";
     this = self.postgresql_10;
     inherit self;
   };