Add unspecified-encoding checker #3826 (#4753)

* Add unspecified-encoding checker #3826
This adds an unspecified-encoding checker that adds a warning
whenever open() is called without an explicit encoding argument.
This closes #3826

* Update tests to conform to unspecified-encoding
With addition of the unspecified-encoding checker calls of open()
need an encoding argument.
Where necessary this argument has been added, or the message has been
disabled.
This also includes small linting changes to a small number
of tests. Their test-data has been updated to reflect new line numbers.

* Update scripts to conform to unspecified-encoding
With addition of the unspecified-encoding checker calls of open()
need an encoding argument.
Where necessary this argument has been added.

* Update pylint to conform to unspecified-encoding
With addition of the unspecified-encoding checker calls of open()
need an encoding argument.
Where necessary this argument has been added.

Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>
Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/unittest_reporting.py b/tests/unittest_reporting.py
index 6b238b484..3946ec61d 100644
--- a/tests/unittest_reporting.py
+++ b/tests/unittest_reporting.py
@@ -128,7 +128,7 @@ def test_multi_format_output(tmp_path):
         linter.reporter.close_output_files()
         del linter.reporter
 
-    with open(json) as f:
+    with open(json, encoding="utf-8") as f:
         assert (
             f.read() == "[\n"
             "    {\n"