Bug 1651214 - Ignore .python-version file at top of checkout r=nalexander

We'll add documentation explicitly recommending people use `pyenv` to install Python versions if they can't use their system package manager. Routine usage of `pyenv` will cause this file to be created at the root of the checkout, so ignore it.

Differential Revision: https://phabricator.services.mozilla.com/D82609

.gitignore

@@ -36,6 +36,8 @@ ID
 /.clang_complete
 /machrc
 /.machrc
+# pyenv artifact
+/.python-version
 
 # Empty marker file that's generated when we check out NSS
 security/manager/.nss.checkout

.hgignore

@@ -32,6 +32,8 @@ compile_commands\.json
 ^config\.log$
 ^\.clang_complete
 ^\.?machrc$
+# pyenv artifact
+^\.python-version$
 
 # Empty marker file that's generated when we check out NSS
 ^security/manager/\.nss\.checkout$