Bump handlebars in samples (#15960)

samples/extensionSamples/package.json

@@ -169,7 +169,7 @@
     },
     "dependencies": {
         "fs-extra": "^5.0.0",
-        "handlebars": "^4.5.3"
+        "handlebars": "^4.7.7"
     },
     "devDependencies": {
         "@types/azdata": "^1.25.0",

samples/extensionSamples/yarn.lock

@@ -1381,7 +1381,7 @@ gulplog@^1.0.0:
   dependencies:
     glogg "^1.0.0"
 
-handlebars@^4.5.3:
+handlebars@^4.7.7:
   version "4.7.7"
   resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.7.7.tgz#9ce33416aad02dbd6c8fafa8240d5d98004945a1"
   integrity sha512-aAcXm5OAfE/8IXkcZvCepKU3VzW1/39Fb5ZuqMtgI/hT8X2YgoMvBY5dLhq/cpOvw7Lk1nK/UF71aLG/ZnVYRA==