Update ruby parser for Ruby v2.7.2

This eliminates the warning:

```
warning: parser/current is loading parser/ruby27, which recognizes
warning: 2.7.1-compliant syntax, but you are running 2.7.2.
```

Gemfile.lock

@@ -87,7 +87,7 @@ GEM
       asciidoctor (>= 1.5.6, < 3.0.0)
     asciidoctor-plantuml (0.0.12)
       asciidoctor (>= 1.5.6, < 3.0.0)
-    ast (2.4.0)
+    ast (2.4.1)
     atlassian-jwt (0.2.0)
       jwt (~> 2.1.0)
     attr_encrypted (3.1.0)
@@ -830,8 +830,8 @@ GEM
     orm_adapter (0.5.0)
     os (1.0.0)
     parallel (1.19.1)
-    parser (2.7.1.2)
-      ast (~> 2.4.0)
+    parser (2.7.2.0)
+      ast (~> 2.4.1)
     parslet (1.8.2)
     peek (1.1.0)
       railties (>= 4.0.0)