deps: update c-ares to 1.18.1

Updated as described in doc/guides/maintaining-c-ares.md.
nodejs · Oct 29, 2021 · d43580d · d43580d
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diff --git a/deps/cares/CHANGES b/deps/cares/CHANGES
diff --git a/deps/cares/CMakeLists.txt b/deps/cares/CMakeLists.txt
diff --git a/deps/cares/CONTRIBUTING.md b/deps/cares/CONTRIBUTING.md
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+Contributing to c-ares
+======================
+
+To contribute patches to c-ares, please generate a GitHub pull request
+and follow these guidelines:
+
+ - Check that the Travis builds are green for your pull request.
+ - Please update the test suite to add a test case for any new functionality.
+ - Build the library with `./configure --enable-debug --enable-maintainer-mode` and
+   ensure there are no new warnings.
+
+To improve the chances of the c-ares maintainers responding to your request:
+
+ - Also send an email to the mailing list at `c-ares@lists.haxx.se` describing your change.
+ - To follow any associated discussion, please subscribe to the [mailing list](http://lists.haxx.se/listinfo/c-ares).