Use latest patch versions of Erlang/OTP when running tests on Travis CI

As suggested[*] by okeuday.

[*] #636 (comment)

Author: g-andrade

.travis.yml

@@ -4,17 +4,17 @@ otp_release:
   - 19.0
   - 19.3
   - 20.0
-  - 20.1
-  - 20.3
-  - 21.0
-  - 21.1.7
-  - 21.2
-  - 21.3
-  - 22.0
-  - 22.1
-  - 22.2
-  - 22.3
-  - 23.0
+  - 20.1.7
+  - 20.3.8.22
+  - 21.0.9
+  - 21.1.4
+  - 21.2.7
+  - 21.3.8.1
+  - 22.0.7
+  - 22.1.8.1
+  - 22.2.8
+  - 22.3.4
+  - 23.0.2
 
 env:
   - TEST=1