Move dependencies to stable version

gradle.properties

@@ -2,7 +2,7 @@ org.gradle.caching=true
 group=org.ballerinalang
 version=0.7.0-SNAPSHOT
 #dependency versions
-ballerinaLangVersion=2.0.0-Preview4-SNAPSHOT
+ballerinaLangVersion=2.0.0-Preview4
 ballerinaTomlParserVersion=1.2.2
 puppycrawlCheckstyleVersion=8.18
 commonsLang3Version=3.8.1
@@ -20,19 +20,19 @@ bouncycastleVersion=1.61
 wso2CommonsPoolVersion=1.5.6.wso2v1
 
 #stdlib dependencies
-stdlibRuntimeVersion=0.5.0-SNAPSHOT
-stdlibCryptoVersion=1.0.0-SNAPSHOT
-stdlibIoVersion=0.5.0-SNAPSHOT
-stdlibLogVersion=1.0.0-SNAPSHOT
-stdlibHttpVersion=1.0.0-SNAPSHOT
-stdlibFileVersion=0.5.1-SNAPSHOT
-stdlibFilepathVersion=0.7.1-SNAPSHOT
-stdlibStringUtilsVersion=0.5.0-SNAPSHOT
-stdlibTimeVersion=1.0.1-SNAPSHOT
-stdlibSystemVersion=0.6.0-SNAPSHOT
-stdlibConfigVersion=1.0.0-SNAPSHOT
-stdlibAuthVersion=1.0.0-SNAPSHOT
-stdlibCacheVersion=2.0.0-SNAPSHOT
-stdlibMimeVersion=1.0.0-SNAPSHOT
-stdlibTaskVersion=1.1.0-SNAPSHOT
-stdlibReflectVersion=0.5.0-SNAPSHOT
+stdlibRuntimeVersion=0.5.0
+stdlibCryptoVersion=1.0.0
+stdlibIoVersion=0.5.0
+stdlibLogVersion=1.0.0
+stdlibHttpVersion=1.0.0
+stdlibFileVersion=0.5.1
+stdlibFilepathVersion=0.7.1
+stdlibStringUtilsVersion=0.5.0
+stdlibTimeVersion=1.0.1
+stdlibSystemVersion=0.6.0
+stdlibConfigVersion=1.0.0
+stdlibAuthVersion=1.0.0
+stdlibCacheVersion=2.0.0
+stdlibMimeVersion=1.0.0
+stdlibTaskVersion=1.1.0
+stdlibReflectVersion=0.5.0