Upgrade ruby to supported version (#477)

Ruby 2.7 has been unsupported for over 2 years. Let's upgrade to a
supported one.

Author: glennsarti

.ruby-version

@@ -1 +1 @@
-2.7
+3.4.4

Gemfile

@@ -1,4 +1,3 @@
 source "https://rubygems.org"
 
 gem "octokit"
-gem "asana"

Gemfile.lock

@@ -3,12 +3,6 @@ GEM
   specs:
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
-    asana (2.0.0)
-      faraday (~> 1.0)
-      faraday_middleware (~> 1.0)
-      faraday_middleware-multi_json (~> 0.0)
-      oauth2 (>= 1.4, < 3)
-    base64 (0.2.0)
     faraday (1.10.4)
       faraday-em_http (~> 1.0)
       faraday-em_synchrony (~> 1.0)
@@ -32,44 +26,21 @@ GEM
     faraday-patron (1.0.0)
     faraday-rack (1.0.0)
     faraday-retry (1.0.3)
-    faraday_middleware (1.2.1)
-      faraday (~> 1.0)
-    faraday_middleware-multi_json (0.0.6)
-      faraday_middleware
-      multi_json
-    hashie (5.0.0)
-    jwt (2.10.1)
-      base64
-    multi_json (1.15.0)
-    multi_xml (0.6.0)
     multipart-post (2.4.1)
-    oauth2 (2.0.9)
-      faraday (>= 0.17.3, < 3.0)
-      jwt (>= 1.0, < 3.0)
-      multi_xml (~> 0.5)
-      rack (>= 1.2, < 4)
-      snaky_hash (~> 2.0)
-      version_gem (~> 1.1)
     octokit (4.25.1)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
     public_suffix (5.1.1)
-    rack (3.1.13)
     ruby2_keywords (0.0.5)
     sawyer (0.9.2)
       addressable (>= 2.3.5)
       faraday (>= 0.17.3, < 3)
-    snaky_hash (2.0.1)
-      hashie
-      version_gem (~> 1.1, >= 1.1.1)
-    version_gem (1.1.7)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  asana
   octokit
 
 BUNDLED WITH
-   1.17.2
+   2.6.7