two fixes for [packagist] schemas (#7782)

* never check for 'require' key in [packagist] /v badge

always use `schema`
closes #7779

* accept str '__unset' for 'require' key in [packagist] /php-v badge

Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>

services/packagist/packagist-base.js

@@ -5,9 +5,12 @@ import { isStable, latest } from '../php-version.js'
 const packageSchema = Joi.array().items(
   Joi.object({
     version: Joi.string().required(),
-    require: Joi.object({
-      php: Joi.string(),
-    }),
+    require: Joi.alternatives(
+      Joi.object({
+        php: Joi.string(),
+      }).required(),
+      Joi.string().valid('__unset')
+    ),
   })
 )
 

services/packagist/packagist-version.service.js

@@ -3,7 +3,6 @@ import { renderVersionBadge } from '../version.js'
 import { optionalUrl } from '../validators.js'
 import { redirector } from '../index.js'
 import {
-  allVersionsSchema,
   keywords,
   BasePackagistService,
   customServerDocumentationFragment,
@@ -84,7 +83,7 @@ class PackagistVersion extends BasePackagistService {
     const json = await this.fetch({
       user,
       repo,
-      schema: includePrereleases ? schema : allVersionsSchema,
+      schema,
       server,
     })
     const versions = json.packages[this.getPackageName(user, repo)]