[Snyk] Security upgrade astro from 5.7.13 to 5.15.9 (#4881)

* fix: packages/site/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ASTRO-14059661
- https://snyk.io/vuln/SNYK-JS-ASTRO-14059122
- https://snyk.io/vuln/SNYK-JS-ASTRO-14059139
- https://snyk.io/vuln/SNYK-JS-ASTROJSINTERNALHELPERS-14059142
- https://snyk.io/vuln/SNYK-JS-ASTROJSINTERNALHELPERS-14059660

* chore(deps): update lock file

---------

Co-authored-by: snyk-bot <[email protected]>
Co-authored-by: Austin Sullivan <[email protected]>

Author: 3 people

packages/site/package.json

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "@patternfly/patternfly-doc-core": "^1.13.1",
-    "astro": "^5.15.6"
+    "astro": "^5.15.9"
   },
   "devDependencies": {
     "tsx": "^4.19.0"

yarn.lock

@@ -7345,7 +7345,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"astro@npm:^5.15.6":
+"astro@npm:^5.15.9":
   version: 5.16.0
   resolution: "astro@npm:5.16.0"
   dependencies:
@@ -21212,7 +21212,7 @@ __metadata:
   resolution: "site@workspace:packages/site"
   dependencies:
     "@patternfly/patternfly-doc-core": "npm:^1.13.1"
-    astro: "npm:^5.15.6"
+    astro: "npm:^5.15.9"
     tsx: "npm:^4.19.0"
   languageName: unknown
   linkType: soft