upgrade guice version to 5.0.1 for java 11 compatibility

[scalar-boney]

Upgrade the guice version to avoid some warnings with java 11

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.google.inject.internal.cglib.core.$ReflectUtils$1 (file:/Users/boney/Documents/scalar-labs/15-mar-2021/scalar/client/build/install/client/lib/guice-4.2.0.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of com.google.inject.internal.cglib.core.$ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

[feeblefakie]

@scalar-boney Please don't skip the CI if it is ready for review.

[scalar-boney]

@scalar-boney Please don't skip the CI if it is ready for review.

Sorry, CI test completed successfully.

[brfrn169]

I have checked that upgrading the guice version doesn't add any warnings (like deprecated classes/methods), and the integration tests (running in java 8) worked. LGTM!

[feeblefakie]

LGTM! Thanks!