user/gtest: bump to 1.8.1

user/gtest/APKBUILD

 # Maintainer: 
 pkgname=gtest
-pkgver=1.8.0
-pkgrel=3
+pkgver=1.8.1
+pkgrel=0
 pkgdesc="C++ testing framework based on xUnit (like JUnit)"
 url="https://github.com/google/googletest"
 arch="all"
@@ -43,4 +43,4 @@ package() {
 	install -m 0644 googletest/cmake/* "$pkgdir"/usr/src/gtest/cmake/
 }
 
-sha512sums="1dbece324473e53a83a60601b02c92c089f5d314761351974e097b2cf4d24af4296f9eb8653b6b03b1e363d9c5f793897acae1f0c7ac40149216035c4d395d9d  release-1.8.0.tar.gz"
+sha512sums="e6283c667558e1fd6e49fa96e52af0e415a3c8037afe1d28b7ff1ec4c2ef8f49beb70a9327b7fc77eb4052a58c4ccad8b5260ec90e4bceeac7a46ff59c4369d7  release-1.8.1.tar.gz"