Add .codspeed folder to .gitignore (#1188)

The folder is created by tests running; it should never be added to the
git tree.

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Co-authored-by: 🇺🇦 Sviatoslav Sydorenko (Святослав Сидоренко) <wk.cvs.github@sydorenko.org.ua>

Author: asvetlov

.gitignore

@@ -86,3 +86,5 @@ TAGS
 
 # pyenv
 .python-version
+
+/.codspeed