cmake-language-server: fix build using latest pygls version

pkgs/development/tools/misc/cmake-language-server/default.nix

···
   patches = [
     # Test timeouts occasionally cause the build to fail
     ./disable-test-timeouts.patch
+
+    # cmake-language-server depends on pygls 0.11, but still works with 0.12
+    ./use-latest-pygls.patch
   ];
 
   postPatch = ''

pkgs/development/tools/misc/cmake-language-server/use-latest-pygls.patch

···
+diff --git a/pyproject.toml b/pyproject.toml
+index bc6251d..39d6686 100644
+--- a/pyproject.toml
++++ b/pyproject.toml
+@@ -19,7 +19,7 @@ classifiers = [
+ 
+ [tool.poetry.dependencies]
+ python = "^3.6"
+-pygls = "^0.11"
++pygls = "^0.12"
+ pyparsing = "^2.4"
+ importlib-metadata = {version = "^4.8", python = "<3.8"}
+