Replace yarn with npm

Author: iKapitonau

.github/workflows/test.yml

@@ -12,5 +12,5 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: "18"
-      - run: yarn
-      - run: yarn test-ci
+      - run: npm
+      - run: npm test-ci

package.json

@@ -14,7 +14,7 @@
     "dist",
     "src",
     "package.json",
-    "yarn.lock",
+    "package-lock.json",
     "README.md",
     "LICENSE",
     "LICENSE.cosmjs"