ci: unpin soloVersion and bump hiero-solo-action to v0.19.0

Signed-off-by: Aman <amkr6207@gmail.com>

Author: amkr6207

.github/workflows/maven.yml

@@ -35,15 +35,14 @@ jobs:
 
       - name: Prepare Hiero Solo
         id: solo
-        uses: hiero-ledger/hiero-solo-action@692b186bd2e4c8d46b9deb1c067dc6ddcf0abcd7 # v0.18.0
+        uses: hiero-ledger/hiero-solo-action@328bc84c3b00a990a151418144fd682a4eb76ea6 # v0.19.0
         with:
           installMirrorNode: true
           hieroVersion: v0.66.0
           mirrorNodeVersion: v0.138.0
           mirrorNodePortRest: 5551
           mirrorNodePortGrpc: 5600
           mirrorNodePortWeb3Rest: 8545
-          soloVersion: 0.46.1
 
       - name: Wait for Mirror Node
         run: |