chore: Set Ruby v2.7 as minimun

Gemfile.lock

@@ -92,7 +92,7 @@ GIT
 PATH
   remote: .
   specs:
-    devise_auth0 (1.1.0)
+    devise_auth0 (1.2.0)
       auth0 (~> 5.6)
       devise (~> 4.8)
       dry-configurable (>= 0.13, < 2.0)
@@ -157,7 +157,7 @@ GEM
       i18n (>= 1.8.11, < 2)
     faraday (2.9.0)
       faraday-net_http (>= 2.0, < 3.2)
-    faraday-http-cache (2.5.0)
+    faraday-http-cache (2.5.1)
       faraday (>= 0.8)
     faraday-net_http (3.1.0)
       net-http
@@ -226,7 +226,7 @@ GEM
       rack (>= 1.2, < 4)
       snaky_hash (~> 2.0)
       version_gem (~> 1.1)
-    omniauth (2.1.1)
+    omniauth (2.1.2)
       hashie (>= 3.4.6)
       rack (>= 2.2.3)
       rack-protection
@@ -254,7 +254,8 @@ GEM
     public_suffix (5.0.4)
     racc (1.7.3)
     rack (2.2.8)
-    rack-protection (3.1.0)
+    rack-protection (3.2.0)
+      base64 (>= 0.1.0)
       rack (~> 2.2, >= 2.2.4)
     rack-test (2.1.0)
       rack (>= 1.3)

devise_auth0.gemspec

@@ -23,6 +23,7 @@ Gem::Specification.new do |s|
 
   s.files = Dir["{app,lib}/**/*", "CHANGELOG.md", "LICENSE.md"]
   s.require_paths = ["lib"]
+  s.required_ruby_version = ">= 2.7.0"
   s.extra_rdoc_files = ["LICENSE.md"]
 
   s.add_runtime_dependency("auth0", "~> 5.6")