chore(deps): bump bootstrap from 4.4.1 to 4.5.0 in /explorer

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 4.4.1 to 4.5.0.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](https://github.com/twbs/bootstrap/compare/v4.4.1...v4.5.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

explorer/package-lock.json

@@ -3081,9 +3081,9 @@
       "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24="
     },
     "bootstrap": {
-      "version": "4.4.1",
+      "version": "4.5.0",
-      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-4.4.1.tgz",
+      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-4.5.0.tgz",
-      "integrity": "sha512-tbx5cHubwE6e2ZG7nqM3g/FZ5PQEDMWmMGNrCUBVRPHXTJaH7CBDdsLeu3eCh3B1tzAxTnAbtmrzvWEvT2NNEA=="
+      "integrity": "sha512-Z93QoXvodoVslA+PWNdk23Hze4RBYIkpb5h8I2HY2Tu2h7A0LpAgLcyrhrSUyo2/Oxm2l1fRZPs1e5hnxnliXA=="
     },
     "brace-expansion": {
       "version": "1.1.11",

explorer/package.json

@@ -14,7 +14,7 @@
     "@types/react": "^16.9.36",
     "@types/react-dom": "^16.9.0",
     "@types/react-router-dom": "^5.1.3",
-    "bootstrap": "^4.4.1",
+    "bootstrap": "^4.5.0",
     "bs58": "^4.0.1",
     "node-sass": "^4.13.1",
     "prettier": "^1.19.1",