Update NetCoreTests.yml

Author: bahusoid

.github/workflows/NetCoreTests.yml

@@ -44,7 +44,7 @@ jobs:
     - name: Set up Firebird
       if: matrix.DB == 'Firebird'
       run: |
-        docker run --name firebird -e EnableWireCrypt=true -e FIREBIRD_USER=nhibernate -e FIREBIRD_PASSWORD=nhibernate -e ISC_PASSWORD=nhibernate -e FIREBIRD_DATABASE=nhibernate -p 3050:3050 -d jacobalberty/firebird
+        docker run --name firebird -e EnableWireCrypt=true -e FIREBIRD_USER=nhibernate -e FIREBIRD_PASSWORD=nhibernate -e ISC_PASSWORD=nhibernate -e FIREBIRD_DATABASE=nhibernate -p 3050:3050 -d jacobalberty/firebird:rc
 
     - uses: actions/checkout@v2
     - name: Setup .NET