create dependabot.yml and update charlist to sigil_c

.github/dependabot.yml

@@ -0,0 +1,14 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "mix" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+    labels:
+      - "hex"
+      - "dependencies"

lib/ex_typesense/document.ex

@@ -191,7 +191,7 @@ defmodule ExTypesense.Document do
 
     path = Path.join([@collections_path, collection_name, @documents_path, @import_path])
     uri = %URI{path: path, query: "action=#{action}"}
-    HttpClient.httpc_run(uri, :post, payload, 'text/plain')
+    HttpClient.httpc_run(uri, :post, payload, ~c"text/plain")
   end
 
   @doc """

lib/ex_typesense/http_client.ex

@@ -7,7 +7,7 @@ defmodule ExTypesense.HttpClient do
   @type request_body() :: iodata() | nil
   @type request_method() :: :get | :post | :delete | :patch | :put
   @type request_path() :: String.t()
-  @api_header_name 'X-TYPESENSE-API-KEY'
+  @api_header_name ~c"X-TYPESENSE-API-KEY"
 
   def get_host, do: Application.get_env(:ex_typesense, :host)
   def get_port, do: Application.get_env(:ex_typesense, :port)
@@ -64,7 +64,7 @@ defmodule ExTypesense.HttpClient do
   end
 
   @spec httpc_run(URI.__struct__(), atom(), String.t(), list()) :: {:ok, map()} | {:error, map()}
-  def httpc_run(uri, method, payload, content_type \\ 'application/json') do
+  def httpc_run(uri, method, payload, content_type \\ ~c"application/json") do
     uri = %URI{
       scheme: get_scheme(),
       host: get_host(),