fix: make Quarkus PR number optional

Signed-off-by: Chris Laprun <[email protected]>

Author: metacosm

.github/workflows/build-for-quarkus-version.yml

@@ -37,7 +37,7 @@ on:
       quarkus-pr:
         description: 'Quarkus PR number to use to run a QOSDK build with'
         type: string
-        required: true
+        required: false
       java-version:
         description: 'Java version to build with'
         type: string