Upgrade mypy (#5071)

.pre-commit-config.yaml

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 6c5dbe1..6981d5f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -39,7 +39,7 @@
         exclude: ^src/blib2to3/
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.19.1
+    rev: v1.20.2
     hooks:
       - id: mypy
         exclude: ^docs/conf.py$

pyproject.toml

diff --git a/pyproject.toml b/pyproject.toml
index ffa7c78..172f713 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -142,7 +142,7 @@
 
 [tool.hatch.build.targets.wheel.hooks.mypyc]
 enable-by-default = false
-dependencies = ["hatch-mypyc>=0.16.0", "mypy==1.19.1"]
+dependencies = ["hatch-mypyc>=0.16.0", "mypy==1.20.2"]
 require-runtime-dependencies = true
 exclude = [
     # There's no good reason for blackd to be compiled.