2 testsuite errors for mmark-ext-0.2.1.2

[juhp]

In the Stackage Nightly build with ghc-8.10.4, seeing some testsuite failures for mmark-ext-0.2.1.2:

      tests/Text/MMark/Extension/TestUtils.hs:26:3: 
      1) Text.MMark.Extension.FontAwesome.fontAwesome, when URI has some other scheme, produces the correct HTML
           expected: "<p><a href=\"https://example.org/\">https://example.org/</a></p>\n"
            but got: "<p><a href=\"https://example.org\">https://example.org</a></p>\n"
    
      To rerun use: --match "/Text.MMark.Extension.FontAwesome/fontAwesome/when URI has some other scheme/produces the correct HTML/
"
    
      tests/Text/MMark/Extension/TableOfContentsSpec.hs:25:7: 
      2) Text.MMark.Extension.TableOfContents.toc works
           expected: "<h1 id=\"lorem-ipsum\">Lorem ipsum</h1>\n<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer varius mi\norci, rhoncus ornare nunc tincidunt nec. Aliquam cursus posuere ornare.\nQuisque posuere euismod nunc, sed pellentesque metus hendrerit eu. Donec\nscelerisque accumsan ante quis interdum. Nullam nec mauris dolor. Lorem\nipsum dolor sit amet, consectetur ....
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