Update grape-path-helpers to v1.5.0

This relaxes the rake requirement so we can upgrade rake to v13, which
comes standard with Ruby v2.7.

Gemfile

@@ -19,7 +19,7 @@ gem 'default_value_for', '~> 3.3.0'
 gem 'pg', '~> 1.1'
 
 gem 'rugged', '~> 0.28'
-gem 'grape-path-helpers', '~> 1.4'
+gem 'grape-path-helpers', '~> 1.5'
 
 gem 'faraday', '~> 1.0'
 gem 'marginalia', '~> 1.9.0'

Gemfile.lock

@@ -500,10 +500,10 @@ GEM
     grape-entity (0.7.1)
       activesupport (>= 4.0)
       multi_json (>= 1.3.2)
-    grape-path-helpers (1.4.0)
+    grape-path-helpers (1.5.0)
       activesupport
       grape (~> 1.3)
-      rake (~> 12)
+      rake (> 12)
     grape_logging (1.8.3)
       grape
       rack
@@ -1366,7 +1366,7 @@ DEPENDENCIES
   gpgme (~> 2.0.19)
   grape (= 1.4.0)
   grape-entity (~> 0.7.1)
-  grape-path-helpers (~> 1.4)
+  grape-path-helpers (~> 1.5)
   grape_logging (~> 1.7)
   graphiql-rails (~> 1.4.10)
   graphlient (~> 0.4.0)