Bump Saxon-HE from 10.6 to 10.8 in /build (usnistgov#1375)

Bumps Saxon-HE from 10.6 to 10.8.

---
updated-dependencies:
- dependency-name: net.sf.saxon:Saxon-HE
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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build/pom.xml

@@ -34,7 +34,7 @@
         <dependency>
             <groupId>net.sf.saxon</groupId>
             <artifactId>Saxon-HE</artifactId>
-            <version>10.6</version>
+            <version>10.8</version>
         </dependency>
         <dependency>
             <groupId>com.xmlcalabash</groupId>