build(deps): update pillow requirement from <10.3,>=10.2 to >=10.2,<1…

…0.4 (#475)

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requirements/testing.txt

@@ -2,6 +2,6 @@
 # --------------------
 
 GitPython>=3.1,<3.2
-Pillow>=10.2,<10.3
+Pillow>=10.2,<10.4
 pytest-cov>=4,<5.1
 validators>=0.20,<0.23