build(deps): update gevent requirement from <27,>=22.10.2 to >=26.4.0,<27 (#113)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/testing.txt

@@ -2,5 +2,5 @@
 pytest>=8.4.2,<9
 pytest-cov>=7.1.0,<8
 Flask>=3.1.3,<4 
-gevent>=22.10.2,<27
+gevent>=26.4.0,<27
 gevent-websocket>=0.10.1,<1