Prefer JBoss mirror over shibboleth repo for opensaml (#6701)

# Description of Changes

Jboss not shibboleth first

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have run `task check` to verify linters, typechecks, and tests
pass
- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#7-testing)
for more details.

app/proprietary/build.gradle

@@ -1,6 +1,6 @@
 repositories {
-    maven { url = "https://build.shibboleth.net/maven/releases" }
     maven { url = "https://repository.jboss.org/" }
+    maven { url = "https://build.shibboleth.net/maven/releases" }
 }
 
 ext {

build.gradle

@@ -187,8 +187,8 @@ subprojects {
         }
         // Maven Central first; mirrors below are fallbacks for niche artifacts.
         mavenCentral()
-        maven { url = "https://build.shibboleth.net/maven/releases" }
         maven { url = "https://repository.jboss.org/" }
+        maven { url = "https://build.shibboleth.net/maven/releases" }
     }
 
     configurations.configureEach {
@@ -585,6 +585,7 @@ repositories {
         }
     }
     mavenCentral()
+    maven { url = "https://repository.jboss.org/" }
     maven { url = "https://build.shibboleth.net/maven/releases" }
 }