Autofix other offenses

- Performance/DeleteSuffix (unsafe)
- Performance/StringReplacement
- Performance/UnfreezeString (unsafe)

lib/haml_lint/linter.rb

@@ -37,7 +37,7 @@ def run(document, autocorrect: nil) # rubocop:disable Metrics
           :error
         )
     rescue StandardError => e
-      msg = "Couldn't process the file".dup
+      msg = +"Couldn't process the file"
       if @autocorrect
         # Those lints related to auto-correction were not saved, so don't display them
         @lints = []
@@ -231,7 +231,7 @@ def tag_with_inline_text(tag_node)
       # excess whitespace
       @document.source_lines[(tag_node.line - 1)...(following_node_line(tag_node) - 1)]
                .map do |line|
-        line.strip.gsub(/\|\z/, '').rstrip
+        line.strip.delete_suffix('|').rstrip
       end.join(' ')
     end
   end

lib/haml_lint/ruby_extraction/chunk_extractor.rb

@@ -546,7 +546,7 @@ def extract_raw_ruby_lines(haml_processed_ruby_code, first_line_index)
       joined_lines = lines.join("\n")
 
       if haml_processed_ruby_code.include?("\n")
-        haml_processed_ruby_code = haml_processed_ruby_code.gsub("\n", ' ')
+        haml_processed_ruby_code = haml_processed_ruby_code.tr("\n", ' ')
       end
 
       haml_processed_ruby_code.split(/[, ]/)