gh-123961: Remove global variable `ModDict` in `_cursesmodule.c` (#12… #430

Job	Run time
Change detection / Compute changed files	5s
Check if generated files are up to date	2m 41s
Windows MSI${{ '' }}	0s
Docs	0s
Address sanitizer	9m 27s
Ubuntu SSL tests with OpenSSL (3.0.15)	2m 24s
Hypothesis tests on Ubuntu	5m 39s
Ubuntu SSL tests with OpenSSL (3.1.7)	2m 18s
Ubuntu SSL tests with OpenSSL (3.2.3)	2m 22s
Ubuntu SSL tests with OpenSSL (3.3.2)	2m 13s
CIFuzz	0s
Thread sanitizer / Thread sanitizer	5m 21s
Thread sanitizer (free-threading) / Thread sanitizer	8m 23s
WASI / build and test	6m 13s
Windows / build (arm64)	3m 30s
Windows (free-threading) / build (arm64)	2m 49s
Windows / build and test (Win32)	16m 17s
Windows / build and test (x64)	15m 32s
Ubuntu (free-threading) / build and test	9m 56s
Windows (free-threading) / build and test (Win32)	23m 32s
Ubuntu / build and test	7m 37s
Windows (free-threading) / build and test (x64)	22m 49s
macOS / build and test (macos-13)	13m 9s
macOS / build and test (macos-14)	7m 21s
macOS (free-threading) / build and test (macos-14)	8m 54s
All required checks pass	1s
	2h 58m 33s

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