Migrate off of Debian 11

[v-firzha]

The pipeline references a Debian 11 image that is EOL (see dotnet/core#9625):

diagnostics/diagnostics.yml

Line 262 in 208833b

container: test_debian_11_amd64

diagnostics/eng/pipelines/pipeline-resources.yml

Line 77 in 208833b

test_debian_11_amd64:

diagnostics/eng/pipelines/pipeline-resources.yml

Line 78 in 208833b

image: mcr.microsoft.com/dotnet-buildtools/prereqs:debian-11-amd64

Update Debian 11 -> 12

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[mthalman]

Related to #5064

[mthalman]

This image tag doesn't exist. This is related to the conversation at dotnet/dotnet-buildtools-prereqs-docker#1276. It's not yet known whether we will even create a debian-12-amd64 image and instead update the existing debian-11-amd64 to a different image type, like Helix.