build: relax constraints of Selenium dependencies versions

https://docs.gradle.org/current/userguide/dependency_downgrade_and_exclude.html: "conflicting strict dependencies will trigger a build failure that you have to resolve".

An attempt to use `java-client:8.0.0-beta` in conjunction with Selenium 4.1.0 leads to build failures, like:
```
   > Could not resolve org.seleniumhq.selenium:selenium-remote-driver:{strictly 4.0.0}.
     Required by:
         project :xxxxxxx > io.appium:java-client:8.0.0-beta
```
In a favor of flexibility the constraints of selenium dependencies versions are relaxed.

Author: valfirst

build.gradle

@@ -33,17 +33,20 @@ dependencies {
 
     api ('org.seleniumhq.selenium:selenium-api') {
         version {
-            strictly "${seleniumVersion}"
+            strictly "[${seleniumVersion}, 5.0)"
+            prefer "${seleniumVersion}"
         }
     }
     api ('org.seleniumhq.selenium:selenium-remote-driver') {
         version {
-            strictly "${seleniumVersion}"
+            strictly "[${seleniumVersion}, 5.0)"
+            prefer "${seleniumVersion}"
         }
     }
     implementation ('org.seleniumhq.selenium:selenium-support') {
         version {
-            strictly "${seleniumVersion}"
+            strictly "[${seleniumVersion}, 5.0)"
+            prefer "${seleniumVersion}"
         }
     }
     implementation 'com.google.code.gson:gson:2.8.9'
@@ -63,7 +66,8 @@ dependencies {
     }
     testImplementation ('org.seleniumhq.selenium:selenium-chrome-driver') {
         version {
-            strictly "${seleniumVersion}"
+            strictly "[${seleniumVersion}, 5.0)"
+            prefer "${seleniumVersion}"
         }
     }
 }