fix: package.json & package-lock.json to reduce vulnerabilities (#1305)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-PDFJSDIST-469200

package-lock.json

@@ -9903,12 +9903,12 @@
       }
     },
     "pdfjs-dist": {
-      "version": "2.0.489",
-      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-2.0.489.tgz",
-      "integrity": "sha1-Y+VLKSqGeQpFRpfrRNQ0e4+/rSc=",
+      "version": "2.0.943",
+      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-2.0.943.tgz",
+      "integrity": "sha512-iLhNcm4XceTHRaSU5o22ZGCm4YpuW5+rf4+BJFH/feBhMQLbCGBry+Jet8Q419QDI4qgARaIQzXuiNrsNWS8Yw==",
       "requires": {
         "node-ensure": "^0.0.0",
-        "worker-loader": "^1.1.1"
+        "worker-loader": "^2.0.0"
       }
     },
     "pend": {
@@ -13949,9 +13949,9 @@
       }
     },
     "worker-loader": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/worker-loader/-/worker-loader-1.1.1.tgz",
-      "integrity": "sha512-qJZLVS/jMCBITDzPo/RuweYSIG8VJP5P67mP/71alGyTZRe1LYJFdwLjLalY3T5ifx0bMDRD3OB6P2p1escvlg==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/worker-loader/-/worker-loader-2.0.0.tgz",
+      "integrity": "sha512-tnvNp4K3KQOpfRnD20m8xltE3eWh89Ye+5oj7wXEEHKac1P4oZ6p9oTj8/8ExqoSBnk9nu5Pr4nKfQ1hn2APJw==",
       "requires": {
         "loader-utils": "^1.0.0",
         "schema-utils": "^0.4.0"

package.json

@@ -69,7 +69,7 @@
     "minimatch-browser": "^1.0.0",
     "moment": "^2.24.0",
     "moment-es6": "1.0.0",
-    "pdfjs-dist": "2.0.489",
+    "pdfjs-dist": "2.0.943",
     "rxjs": "^6.5.2",
     "zone.js": "0.8.29"
   },