update to base64 0.13

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

debian/control

@@ -8,7 +8,7 @@ Build-Depends: debhelper (>= 12),
  libstd-rust-dev,
  librust-anyhow-1+default-dev,
  librust-apt-pkg-native-0.3+default-dev (>= 0.3.2-~~),
- librust-base64-0.12+default-dev,
+ librust-base64-0.13+default-dev,
  librust-bitflags-1+default-dev (>= 1.2.1-~~),
  librust-bytes-1+default-dev,
  librust-cidr-0.2+default-dev (>= 0.2.1-~~),