[Release 1.0.3] Next development version (take 2)

Adjust the invalid versions that were set by the next dev version
workflow.

gradle.properties

@@ -1,5 +1,5 @@
 version=1.0.4-SNAPSHOT
-version.samples=1.0.4-SNAPSHOT
+version.samples=1.0.3
 
 org.gradle.caching=true
 org.gradle.parallel=true

gradle/libs.versions.toml

@@ -23,7 +23,7 @@ hamcrest = "2.2"
 mockito = "5.10.0"
 spring-dep-mgmt = "1.1.4"
 spring-boot = "3.2.3-SNAPSHOT"
-spring-boot-for-docs = "3.2.4-SNAPSHOT"
+spring-boot-for-docs = "3.2.3"
 spring-cloud-stream = "4.1.0"
 spring-retry = "2.0.5"
 system-lambda = "1.2.1"