Bump version to 0.7.0 for new release

- Version 0.6.0 is already released
- Increment to 0.7.0 for this new feature release with optional dependencies

Co-authored-by: 4n4nd <22333506+4n4nd@users.noreply.github.com>

Author: Copilot

prometheus_api_client/__init__.py

@@ -1,7 +1,7 @@
 """A collection of tools to collect and manipulate prometheus metrics."""
 
 __title__ = "prometheus-connect"
-__version__ = "0.6.0"
+__version__ = "0.7.0"
 
 from .exceptions import PrometheusApiClientException, MetricValueConversionError
 def __getattr__(name):