[Pkg-rust-maintainers] Bug#1055090: rust-backtrace: please update to v0.3.69

[Peter Michael Green]

 > Please update to (at least) newer upstream release v0.3.69.

Backtrace itself is not semver breaking, but some of it's dependencies
are.

backtrace 0.3.68 -> 0.3.69
addr2line 0.20.0 -> 0.21.0
fallible-iterator 0.2.0 -> 0.3.0
gimli 0.27.3 -> 0.28.1
object 0.31.1 -> 0.32.1

I've uploaded these to experimental.

Checking out the reverse dependencies:

dwarf2sources - builds ok against new packages, dependency tweak 
required, no autopkgtests
rust-cargo-auditable - builds ok against new packages, dependency tweak 
required, no autopkgtests
rust-elfx86exts - new version builds ok against new packages, no 
autopkgtests.
rust-framehop - needs a patch 
https://github.com/mstange/framehop/issues/12 no rdeps
pdb - has a pre-existing test issue, after dealing with that builds and 
tests fine with dependency bumped.
postgres-protocol - builds and tests ok after dependency bump.
postgres-types - builds and tests ok after dependency bump
tokio-postgres - builds ok after dependency bump, but tests are already 
broken (and marked as such)
postgres - builds ok after dependency bump, but tests are already broken 
(and marked as such)
rusqlite - builds and tests ok after dependency bump, upstream bumped 
with no code changes.
rust-wasmtime (librust-cranelift-dev) - jonas package, builds and 
autopkgtests ok with dependency bumped. 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1056924
sccache - jonas package, already broken and not in testing.

I've uploaded this to experimental, now waiting to see what
(if-any) responses I get to the bug reports.