Backport to branch(3) : Update ScalarDB dependency version to 3.15.1 in README (#2518)

Co-authored-by: Toshihiro Suzuki <[email protected]>

Author: feeblefakie

README.md

@@ -10,7 +10,7 @@ You can install it in your application using your build tool such as Gradle and
 To add a dependency on ScalarDB using Gradle, use the following:
 ```gradle
 dependencies {
-    implementation 'com.scalar-labs:scalardb:3.15.0'
+    implementation 'com.scalar-labs:scalardb:3.15.1'
 }
 ```
 
@@ -19,7 +19,7 @@ To add a dependency using Maven:
 <dependency>
   <groupId>com.scalar-labs</groupId>
   <artifactId>scalardb</artifactId>
-  <version>3.15.0</version>
+  <version>3.15.1</version>
 </dependency>
 ```