pin Antora Lunr & PDF extensions to their alpha versions

Author: Rudra-sandeep

package.json

@@ -4,12 +4,12 @@
   "description": "",
   "main": "index.js",
   "devDependencies": {
-    "@antora/cli": "^3.0.0",
-    "@antora/site-generator-default": "^3.0.0",
-    "@antora/lunr-extension": "^1.0.0",
-    "@antora/pdf-extension": "^1.0.0",
-    "@antora/asciidoc-loader": "^1.0.0",
-    "asciidoctor-kroki": "^1.0.0"
+  "@antora/cli": "^3.0.0",
+  "@antora/site-generator-default": "^3.0.0",
+ "@antora/lunr-extension": "1.0.0-alpha.10",
+ "@antora/pdf-extension": "1.0.0-alpha.12",
+  "@antora/asciidoc-loader": "^1.0.0",
+  "asciidoctor-kroki": "^0.18.1"
   },
   "dependencies": {
     "abort-controller": "^3.0.0",