bug #18246 [DependencyInjection] fix ambiguous services schema (backbone87)

This PR was merged into the 2.3 branch.

Discussion
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[DependencyInjection] fix ambiguous services schema

| Q             | A
| ------------- | ---
| Branch?       | 2.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   |
| Fixed tickets | #17460 #2122
| License       | MIT

Commits
-------

9828f23 bug #17460 [DI] fix ambiguous services schema

Author: fabpot

Loader/schema/dic/services/services-1.0.xsd

@@ -24,14 +24,28 @@
       ]]></xsd:documentation>
     </xsd:annotation>
     <xsd:sequence>
-      <xsd:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded" />
-      <xsd:element name="imports" type="imports" minOccurs="0" maxOccurs="1" />
-      <xsd:element name="parameters" type="parameters" minOccurs="0" maxOccurs="1" />
-      <xsd:element name="services" type="services" minOccurs="0" maxOccurs="1" />
-      <xsd:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded" />
+      <xsd:group ref="foreign" />
+      <xsd:sequence minOccurs="0">
+        <xsd:element name="imports" type="imports" />
+        <xsd:group ref="foreign" />
+      </xsd:sequence>
+      <xsd:sequence minOccurs="0">
+        <xsd:element name="parameters" type="parameters" />
+        <xsd:group ref="foreign" />
+      </xsd:sequence>
+      <xsd:sequence minOccurs="0">
+        <xsd:element name="services" type="services" />
+        <xsd:group ref="foreign" />
+      </xsd:sequence>
     </xsd:sequence>
   </xsd:complexType>
 
+  <xsd:group name="foreign">
+    <xsd:sequence>
+      <xsd:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded" />
+    </xsd:sequence>
+  </xsd:group>
+
   <xsd:complexType name="services">
     <xsd:annotation>
       <xsd:documentation><![CDATA[