Update Black to 21.6b0

This found a few docstrings that I had messed up.

tildes/requirements-dev.txt

@@ -6,7 +6,7 @@ astroid==2.6.2
 attrs==20.2.0
 backcall==0.2.0
 beautifulsoup4==4.9.3
-black==20.8b1
+black==21.6b0
 bleach==3.2.1
 cached-property==1.5.2
 certifi==2020.6.20
@@ -42,7 +42,7 @@ mypy==0.910
 packaging==20.4
 parso==0.7.1
 pastedeploy==2.1.1
-pathspec==0.8.0
+pathspec==0.8.1
 pep517==0.10.0
 pep8-naming==0.12.0
 pexpect==4.8.0

tildes/tests/test_simplestring_field.py

@@ -78,13 +78,13 @@ def test_control_chars_removed():
 
 
 def test_zero_width_joiners_kept_and_collapsed():
-    """"Ensure that multiple zero width joiners are collapsed like spaces."""
+    """Ensure that multiple zero width joiners are collapsed like spaces."""
     original = "🤷\u200D\u200D\u200D♀\u200d"
     assert process_string(original) == "🤷\u200D♀"
 
 
 def test_zero_width_joiners_allowed_inside_emojis_and_not_other_words():
-    """"Ensure the zero width joiner char is kept inside emojis."""
+    """Ensure the zero width joiner char is kept inside emojis."""
     original = "🤷\u200D♀ foo\u200dbar"
     assert process_string(original) == "🤷\u200D♀ foobar"
 

tildes/tests/test_topic_tags.py

@@ -33,6 +33,6 @@ def test_tags_lowercased(text_topic):
 
 
 def test_tags_synonyms(text_topic):
-    """ Ensure synonyms are replaced."""
+    """Ensure synonyms are replaced."""
     text_topic.tags = ["spoilers"]
     assert text_topic.tags == ["spoiler"]