pin rust to bullseye to compile rcodesign properly

[upodroid]

glibc compile errors :(

I need to look into how to do CGO_ENABLED=0 for rust

https://storage.googleapis.com/knative-prow/logs/nightly_kn-plugin-operator_main_periodic/1706246691578974208/build-log.txt

/cc @kvmware @cardil

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@@ Notarizing macOS Binaries for the release @@@@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@@ 2023-09-25 10:18:54.997020338+00:00
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
rcodesign: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by rcodesign)
rcodesign: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by rcodesign)
rcodesign: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by rcodesign)
rcodesign: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by rcodesign)
rcodesign: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by rcodesign)
rcodesign: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by rcodesign)
  adding: kn-operator-darwin-amd64 (deflated 72%)
  adding: kn-operator-darwin-arm64 (deflated 73%)
rcodesign: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by rcodesign)
rcodesign: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by rcodesign)
rcodesign: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by rcodesign)

[krsna-m]

/lgtm
/approve

[knative-prow]

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