Describe the bug
When reading environment properties, Koin assumes that all properties are strings.

However, due to legacy java API weirdness, this is not guaranteed to be the case, and both keys and values could be arbitrary objects.

Therefore when Koin does the hard cast to strings, the application might crash.

To Reproduce

1. Set non-string properties via System.setProperties()
2. Start Koin framework

Expected behavior
Koin starts up fine, ignoring any invalid properties.

Koin module and version:
koin-core-jvm:4.0.4

Snippet or Sample project to help reproduce

var properties = new Properties();

// save existing properties just in case
properties.putAll(System.getProperties());

// intentionally malformed input
properties.put(new Object(), new Object());

// just replace the existing map
System.setProperties(properties);

// start Koin.....

ref: Up-Mods/HT_DiscordBridge#4
ref: Up-Mods/HT_DiscordBridge#6