chore(KNO-12220): update css-inline to version that fixes important inlinging (#14)

Author: jareddellitt

native/css_inline_nif/Cargo.lock

@@ -17,4 +17,4 @@ nif_version_2_17 = ["rustler/nif_version_2_17"]
 
 [dependencies]
 rustler = "0.37"
-css-inline = "0.20.0"
+css-inline = "0.20.1"

native/css_inline_nif/Cargo.toml

@@ -273,44 +273,9 @@ defmodule CSSInlineTest do
 
     test "preserves !important when inlining styles" do
       assert {:ok, result} = CSSInline.inline(@email_html)
-      assert result =~ ~r/style="[^"]*!important/
-    end
-
-    @production_opts [
-      load_remote_stylesheets: false,
-      keep_link_tags: true,
-      keep_style_tags: true
-    ]
-
-    test "production settings: inlined selectors remain in <style> without remove_inlined_selectors" do
-      assert {:ok, result} = CSSInline.inline(@email_html, @production_opts)
-
-      assert result =~ ~r/style="[^"]*!important/,
-             "Inlined styles should preserve !important"
-
-      [_, style_content] = Regex.run(~r/<style[^>]*>(.*?)<\/style>/s, result)
-
-      assert style_content =~ "u + #body a",
-             "Non-inlinable selectors should remain in <style> tag"
-
-      assert style_content =~ ".button a",
-             "Without remove_inlined_selectors, inlined selectors remain in <style>"
-    end
-
-    test "production settings + remove_inlined_selectors strips inlined rules from <style>" do
-      {:ok, result} =
-        CSSInline.inline(@email_html, [remove_inlined_selectors: true] ++ @production_opts)
-
-      assert result =~ ~r/style="[^"]*color:[^"]*!important/,
-             "Inlined styles should preserve !important"
-
-      [_, style_content] = Regex.run(~r/<style[^>]*>(.*?)<\/style>/s, result)
-
-      assert style_content =~ "u + #body a",
-             "Non-inlinable selectors (complex email client overrides) must remain"
 
-      refute style_content =~ ".button a",
-             "Inlined selectors should be removed from <style> to prevent conflicts"
+      assert result =~
+               "<a href=\"https://example.com\" style=\"color:#ffffff !important;font-size:16px !important;font-weight:bold !important\">"
     end
   end