Add spelling correction for Mitigate and variants.

codespell_lib/data/dictionary.txt

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index 0554236..908fbd7 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -38781,6 +38781,12 @@
 mitake->mistake
 mitaken->mistaken
 mitakes->mistakes
+mitgate->mitigate
+mitgated->mitigated
+mitgates->mitigates
+mitgating->mitigating
+mitgation->mitigation
+mitgations->mitigations
 miticate->mitigate
 miticated->mitigated
 miticateing->mitigating