feat(core): migrate everything to ESM-only

package.json

@@ -3,6 +3,7 @@
     "version": "6.0.0",
     "private": true,
     "description": "Publish code coverage to Code Climate",
+    "type": "module",
     "main": "lib/main.js",
     "packageManager": "[email protected]",
     "scripts": {
@@ -35,14 +36,17 @@
         "@actions/exec": "1.1.1",
         "@actions/github": "6.0.0",
         "@actions/glob": "0.4.0",
-        "hook-std": "2.0.0",
-        "node-fetch": "2.7.0",
+        "hook-std": "3.0.0",
+        "node-fetch": "3.3.2",
         "openpgp": "5.11.1"
     },
     "devDependencies": {
         "@biomejs/biome": "1.7.1",
         "@openpgp/web-stream-tools": "0.1.1",
+        "@tapjs/core": "1.5.2",
         "@tapjs/test": "1.4.2",
+        "@tsconfig/node20": "20.1.4",
+        "@tsconfig/strictest": "2.0.5",
         "@types/node": "20.12.7",
         "@types/node-fetch": "2.6.11",
         "@types/sinon": "17.0.3",
@@ -51,7 +55,8 @@
         "nock": "13.5.4",
         "sinon": "17.0.1",
         "tap": "18.7.2",
-        "to-readable-stream": "2.1.0",
+        "to-readable-stream": "4.0.0",
+        "ts-node": "10.9.2",
         "typescript": "5.4.5",
         "which": "4.0.0"
     }