[Pkg-rust-maintainers] Bug#1026812: rust-base64: please upgrade to branch v0.20

[Fabian Grünbichler]

with sequoia being released with base64 0.21 support, I will start
preparing updates for the crates below (at least those maintained by the
Rust team - coordinating with team members as necessary, of course).

I haven't decided yet whether uploading to experimental is the way to
go, or whether straight to unstable post-bookworm makes more sense.

I'll update this bug report accordingly.

Versions of rust-base64 in unstable:
  librust-base64-dev                               0.13.0-1

Versions of rdeps of rust-base64 in unstable, that also exist in testing:
  librust-alacritty-terminal-dev                   0.17.0-1         depends on     librust-base64-0.13+default-dev,
  librust-cargo-dev                                0.66.0-1         depends on     librust-base64-0.13+default-dev,
  librust-cookie-dev                               0.16.0-1         depends on     librust-base64-0.13+default-dev,
  librust-fernet-dev                               0.2.0+really0.1.4-2 depends on     librust-base64-0.13+default-dev,
  librust-grep-printer-dev                         0.1.6-1          depends on     librust-base64-0.13+default-dev,
  librust-jsonwebtoken-dev                         8.2.0-1+b1       depends on     librust-base64-0.13+default-dev,
  librust-oauth2-dev                               4.3.0-1+b1       depends on     librust-base64-0.13+default-dev,
  librust-pem-dev                                  1.0.2-1          depends on     librust-base64-0.13+default-dev,
  librust-plist-dev                                1.3.1-1          depends on     librust-base64-0.13+default-dev,
  librust-postgres-protocol-dev                    0.6.4-1+b1       depends on     librust-base64-0.13+default-dev,
  librust-reqwest-dev                              0.11.13-1        depends on     librust-base64-0.13+default-dev,
  librust-ron-dev                                  0.7.1-1          depends on     librust-base64-0.13+default-dev,
  librust-ruma-common-dev                          0.10.5-2         depends on     librust-base64-0.13+default-dev,
  librust-rust-argon2-dev                          1.0.0-2          depends on     librust-base64-0.13+default-dev,
  librust-rustls-pemfile-dev                       1.0.0-1+b1       depends on     librust-base64-0.13+default-dev,
  librust-sequoia-autocrypt-dev                    0.24.0-1         depends on     librust-base64+default-dev (>= 0.12-~~),
  librust-sequoia-net-dev                          0.25.0-2         depends on     librust-base64+default-dev (>= 0.12-~~),
  librust-sequoia-openpgp-dev                      1.12.0-2         depends on     librust-base64-0.13+default-dev | librust-base64-0.12+default-dev,
  librust-sniffglue-dev                            0.15.0-3+b2      depends on     librust-base64-0.13+default-dev,
  librust-totp-rs-dev                              3.0.1-2          depends on     librust-base64-0.13+default-dev,
  librust-transmission-client-dev                  0.1.3-2          depends on     librust-base64-0.13+default-dev,
  librust-ureq-dev                                 2.6.2-3          depends on     librust-base64-0.13+default-dev,

Source packages in unstable whose autopkgtests are triggered by rust-base64:
  rust-base64ct                                    1.5.1-1          triggered by     librust-base64-dev=0.13.0-1
  rust-native-tls                                  0.2.11-1         triggered by     librust-base64-dev=0.13.0-1
  rust-psa-crypto                                  0.9.2-2          triggered by     librust-base64-dev=0.13.0-1
  rust-rustls                                      0.20.8-4         triggered by     librust-base64-dev=0.13.0-1
  rust-ttf-parser                                  0.15.2-1         triggered by     librust-base64-dev=0.13.0-1
  rust-webpki                                      0.22.0-1         triggered by     librust-base64-dev=0.13.0-1