Update maven example version to a 1.21.1 build and one that contains the breaking API changes we made to chemicals

Author: pupnewfster

README.md

@@ -86,7 +86,7 @@ dependencies {
 Add the following to your `gradle.properties` file (see [Maven](https://modmaven.dev/mekanism/Mekanism/) for the list of available versions):
 
 ```properties
-mekanism_version=1.21-10.6.6.53
+mekanism_version=1.21.1-10.7.0.55
 ```
 
 # Credits #