[FL-3098] Up toolchain to version 20 (#2397)

* Up toolchain to 20
* Python reformat, add version info into fbtenv

Co-authored-by: あく <alleteam@gmail.com>

scripts/flipper/utils/cdc.py

@@ -1,5 +1,6 @@
 import serial.tools.list_ports as list_ports
 
+
 # Returns a valid port or None, if it cannot be found
 def resolve_port(logger, portname: str = "auto"):
     if portname != "auto":

scripts/flipper/utils/templite.py

@@ -173,12 +173,14 @@ class Templite:
         """Renders the template according to the given namespace."""
         stack = []
         namespace["__file__"] = self.file
+
         # add write method
         def write(*args):
             for value in args:
                 stack.append(str(value))
 
         namespace["write"] = write
+
         # add include method
         def include(file):
             if not os.path.isabs(file):