chore: remove pin in requirements as support for python 3.7 was dropped

requirements.txt

@@ -2,12 +2,10 @@
 # This file is autogenerated by pip-compile with Python 3.11
 # by the following command:
 #
-#    pip-compile -r requirements.in
+#    pip-compile requirements.in
 #
-holidays<0.28 ; python_version < "3.8"
-holidays>=0.28 ; python_version >= "3.8"
-    # via
-    #   -r requirements.in
+holidays==0.40
+    # via -r requirements.in
 python-dateutil==2.8.2
     # via
     #   -r requirements.in