Update googletest requirement from 0.11.0 to 0.12.0

Updates the requirements on googletest to permit the latest version.

Release notes

v0.12.0

Breaking changes

Matcher trait definition

The Matcher trait definition has changed:

Pre 0.12.0
pub trait Matcher {
    type ActualT: Debug + ?Sized;
    fn matches(&self, actual: &Self::ActualT) -> MatcherResult;
}
0.12.0
pub trait Matcher<ActualT: Debug + Copy> {
    fn matches(&self, actual: ActualT) -> MatcherResult;
}
This makes the trait implementation more generic in three ways:

A single struct can implement Matcher for multiple types, since Actual is now a generic type parameter.

ActualT can be passed as value if it implements Copy, which solved #351.

When ActualT is a reference, the Matcher implementation can put constraint on its lifetime, which solved #323.

We tried to make sure this change had as limited an impact on users of the library as possible. Often, the library can be updated without changes on the tests. However, there are two areas requiring changes:

Matcher implementation

Obviously, libraries implementing their own matcher will need to update their implementation to match the new trait definition. For instance:

Pre 0.12.0
#[derive(Debug)]
enum MyEnum {
    ...
}
struct MyEnumMatcher { ... }
impl Matcher for MyEnumMatcher {
type ActualT = MyEnumMatcher;
fn matches(&amp;self, actual: &amp;Self::ActualT) -&gt; MatcherResult {
    match actual {
        ...
    }
}

</tr></table>

... (truncated)

Commits

de68875 Merge pull request #442 from google:new_version
70a6da1 Generalize into_test_result() extension method to all std::result::Result and...
63421a6 Eliminate an unnecessary memory allocation in is_utf8_string
876dbe2 Prepare for 0.12 release.
89655d0 Handle non-copyable type in (expect|verify)_(ne|eq)!
c33408e Handle non-copyable type in (expect|verify)_(ne|eq)!
07dffcf Handle non-copyable type in (expect|verify)_(ne|eq)!
cccc94a Add #[track_caller] since near can panic.
896b468 Merge pull request #436 from google:cargo_lock
ac19539 Add new latest deps workflow.
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Codecov Report

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Additional details and impacted files

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