Bump github.com/onsi/gomega from 1.11.0 to 1.12.0

Bumps [github.com/onsi/gomega](https://github.com/onsi/gomega) from 1.11.0 to 1.12.0.
- [Release notes](https://github.com/onsi/gomega/releases)
- [Changelog](https://github.com/onsi/gomega/blob/master/CHANGELOG.md)
- [Commits](https://github.com/onsi/gomega/compare/v1.11.0...v1.12.0)

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/onsi/gomega/gbytes/buffer.go

@@ -108,6 +108,22 @@ func (b *Buffer) Read(d []byte) (int, error) {
 	return n, nil
 }
 
+/*
+Clear clears out the buffer's contents
+*/
+func (b *Buffer) Clear() error {
+	b.lock.Lock()
+	defer b.lock.Unlock()
+
+	if b.closed {
+		return errors.New("attempt to clear closed buffer")
+	}
+
+	b.contents = []byte{}
+	b.readCursor = 0
+	return nil
+}
+
 /*
 Close signifies that the buffer will no longer be written to
 */