refactor: use property variables for dependency versions

- Replace hardcoded SLF4J version with property reference in all modules
- Replace hardcoded JUnit Jupiter version with property reference
- Update testcontainers junit-jupiter from 1.20.4 to 1.20.5

Improves consistency and eases future version updates by centralizing version
definitions in the parent POM.

🤖 Generated with Claude Code
Co-Authored-By: Claude <[email protected]>

Author: samspycher

parsec-client-java/pom.xml

@@ -25,7 +25,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>1.7.32</version>
+            <version>${slf4j.version}</version>
         </dependency>
         <dependency>
             <groupId>net.java.dev.jna</groupId>
@@ -53,7 +53,7 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-api</artifactId>
-            <version>5.8.0</version>
+            <version>${junit.jupiter.version}</version>
             <scope>test</scope>
         </dependency>
     </dependencies>

parsec-interface-java/pom.xml

@@ -25,7 +25,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>1.7.32</version>
+            <version>${slf4j.version}</version>
         </dependency>
     </dependencies>
 

parsec-jca-java/pom.xml

@@ -25,7 +25,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>1.7.32</version>
+            <version>${slf4j.version}</version>
         </dependency>
 
 

parsec-testcontainers/pom.xml

@@ -13,17 +13,17 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-api</artifactId>
-            <version>5.11.4</version>
+            <version>${junit.jupiter.version}</version>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-engine</artifactId>
-            <version>5.11.4</version>
+            <version>${junit.jupiter.version}</version>
         </dependency>
         <dependency>
             <groupId>org.testcontainers</groupId>
             <artifactId>junit-jupiter</artifactId>
-            <version>1.20.4</version>
+            <version>1.20.5</version>
         </dependency>
     </dependencies>
     <properties>