Set stacklevel=2 for DeprecationWarning

[cdce8p]

Emit DeprecationWarning for caller. All other __getattr__ functions already set stacklevel=2 correctly.

pysmi/pysmi/parser/dialect.py

Lines 41 to 45 in 65442a5

	warnings.warn(
	f"{attr} is deprecated. Please use {new_attr} instead.",
	DeprecationWarning,
	stacklevel=2,
	)

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[cdce8p]

@lextm Sorry about that, but I'm not signing a CLA for a one-line change. Feel free to use it as you see fit or close it. My intention was just to fix a small overside here.