build(deps): bump acorn from 7.0.0 to 7.1.1 in /tools/sva

Bumps [acorn](https://github.com/acornjs/acorn) from 7.0.0 to 7.1.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/7.0.0...7.1.1)

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/tools/sva/yarn.lock b/tools/sva/yarn.lock
index be19e7c..11ba12f 100644
--- a/tools/sva/yarn.lock
+++ b/tools/sva/yarn.lock
@@ -47,9 +47,9 @@
   integrity sha512-tiNTrP1MP0QrChmD2DdupCr6HWSFeKVw5d/dHTu4Y7rkAkRhU/Dt7dphAfIUyxtHpl/eBVip5uTNSpQJHylpAw==
 
 acorn@^7.0.0:
-  version "7.0.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.0.0.tgz#26b8d1cd9a9b700350b71c0905546f64d1284e7a"
-  integrity sha512-PaF/MduxijYYt7unVGRuds1vBC9bFxbNf+VWqhOClfdgy7RlVkQqt610ig1/yxTgsDIfW1cWDel5EBbOy3jdtQ==
+  version "7.1.1"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.1.1.tgz#e35668de0b402f359de515c5482a1ab9f89a69bf"
+  integrity sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==
 
 ajv@6.5.3:
   version "6.5.3"