Update gemspec

Author: jho406

props_template.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = ">= 2.5"
 
-  s.add_dependency "activesupport", ">= 6.1.0"
-  s.add_dependency "actionview", ">= 6.1.0"
-  s.add_dependency "oj", ">= 3.9"
+  s.add_dependency "activesupport", "~> 7.0", "~> 8.0"
+  s.add_dependency "actionview", "~> 7.0", "~> 8.0"
+  s.add_dependency "oj", "~> 3.9"
 end