chore: update scala-library from 2.13.7 to 2.13.15

Author: jona7o

.github/workflows/test.yml

@@ -48,7 +48,7 @@ jobs:
             - name: Install gcloud beta
               run: |
                   gcloud components install cloud-datastore-emulator
-            - name: Test with Scala 2.13.7
+            - name: Test with Scala 2.13.15
               run: |
                   gcloud beta emulators datastore start --no-store-on-disk --consistency=1.0 &
                   sleep 10

build.sbt

@@ -2,7 +2,7 @@ import sbt.Keys.parallelExecution
 
 name := "akka-persistence-gcp-datastore"
 
-val mainScala = "2.13.7"
+val mainScala = "2.13.15"
 val allScala = Seq("2.12.15", mainScala)
 
 val akkaVersion = "2.6.17"