Update dependency org.seasar.doma:doma-core to v3.8.0

Author: renovate[bot]

codegen-test/gradle.properties

@@ -1,2 +1,2 @@
-domaVersion=3.7.0
+domaVersion=3.8.0
 h2Version=2.3.232

codegen/build.gradle.kts

@@ -51,7 +51,7 @@ repositories {
 
 dependencies {
     implementation("org.freemarker:freemarker:2.3.34")
-    testImplementation("org.seasar.doma:doma-core:3.7.0")
+    testImplementation("org.seasar.doma:doma-core:3.8.0")
 
     // Use JUnit BOM for version management
     testImplementation(platform("org.junit:junit-bom:5.12.2"))