app-backup/b2: Bump to 3.9.0

Signed-off-by: Wolfgang E. Sanyer <ezzieyguywuf@gmail.com>

app-backup/b2/files/b2-3.9.0-disable-pip-requirement-installs.patch

@@ -0,0 +1,23 @@
+# These configurations attempt to install missing dependencies using pip, which
+# violates the network sandbox. Instead, we'll manage the dependencies in
+# portage.
+--- a/setup.py
++++ b/setup.py
+@@ -104,7 +104,7 @@
+     # requirements files see:
+     # https://packaging.python.org/en/latest/requirements.html
+     dependency_links=[],
+-    install_requires=read_requirements(),
++    # install_requires=read_requirements(),
+
+     # List additional groups of dependencies here (e.g. development
+     # dependencies). You can install these using the following syntax,
+@@ -114,7 +114,7 @@
+         'doc': read_requirements('doc'),
+         'license': read_requirements('license'),
+     },
+-    setup_requires=['setuptools_scm<6.0'],
++    # setup_requires=['setuptools_scm<6.0'],
+     use_scm_version=True,
+
+     # If there are data files included in your packages that need to be