Move jsr305 version to version.gradle

sop-java-picocli/build.gradle

@@ -23,8 +23,9 @@ dependencies {
 
     // CLI
     implementation "info.picocli:picocli:$picocliVersion"
-    // https://mvnrepository.com/artifact/com.google.code.findbugs/jsr305
-    implementation group: 'com.google.code.findbugs', name: 'jsr305', version: '3.0.2'
+
+    // @Nonnull, @Nullable...
+    implementation "com.google.code.findbugs:jsr305:$jsrVersion"
 }
 
 mainClassName = 'sop.cli.picocli.SopCLI'
@@ -48,4 +49,3 @@ jar {
         exclude "META-INF/*.RSA"
     }
 }
-

version.gradle

@@ -12,5 +12,6 @@ allprojects {
         junitSysExitVersion = '1.1.2'
         picocliVersion = '4.6.3'
         mockitoVersion = '4.5.1'
+        jsrVersion = '3.0.2'
     }
 }