fix: plugins/microsoft-calendar/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-DIFF-14917201
- https://snyk.io/vuln/SNYK-JS-TAR-15032660

Author: snyk-io[bot]

plugins/microsoft-calendar/package.json

@@ -41,10 +41,10 @@
     "postpack": "backstage-cli package postpack"
   },
   "dependencies": {
-    "@backstage/core-components": "workspace:^",
+    "@backstage/core-components": "0.8.6",
     "@backstage/core-plugin-api": "workspace:^",
     "@backstage/errors": "workspace:^",
-    "@backstage/theme": "workspace:^",
+    "@backstage/theme": "0.1.1",
     "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.9.1",
     "@microsoft/microsoft-graph-types": "^2.25.0",