Upgrade rollup from v2.56.3 to v3.20.0.

Also drop Node.js v12 from CI, since rollup@3 no longer supports it.

Author: benjamn

.github/workflows/main.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        node_version: ['12', '14', '16', '18', '19']
+        node_version: ['14', '16', '18', '19']
         os: [ubuntu-latest]
 
     steps:

package-lock.json

@@ -42,7 +42,7 @@
     "@types/node": "^16.9.1",
     "mocha": "^9.1.1",
     "rimraf": "^3.0.2",
-    "rollup": "^2.9.1",
+    "rollup": "^3.20.0",
     "source-map-support": "^0.5.19",
     "tslib": "^2.5.0",
     "typescript": "^5.0.2"