Bump clang-tools from 0.8.0 to 0.9.0 (#165) · cpp-linter/cpp-linter-action@e5eb3b9

static_assert failed "Error in C++ Standard Library usage."

use a trailing return type for this function

use a trailing return type for this function

statement should be inside braces

do not call c-style vararg functions

use a trailing return type for this function

use nullptr

File src/demo.cpp does not conform to Custom style guidelines. (lines 2)

File src/demo.hpp does not conform to Custom style guidelines. (lines 1, 7, 10, 14, 37, 39)

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