.github: fix OS version for galexie CI (#5559)

Author: tamirms

.github/workflows/galexie-release.yml

@@ -8,7 +8,7 @@ jobs:
 
   publish-docker:
     name: Test and push docker image
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     env:
       GALEXIE_INTEGRATION_TESTS_ENABLED: "true"
       GALEXIE_INTEGRATION_TESTS_CAPTIVE_CORE_BIN: /usr/bin/stellar-core

.github/workflows/galexie.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   galexie:
     name: Test
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     env:
       CAPTIVE_CORE_DEBIAN_PKG_VERSION: 22.0.0-2138.721fd0a65.focal
       GALEXIE_INTEGRATION_TESTS_ENABLED: "true"