deps: [WIP] [iceberg] bump Iceberg Rust to 0.8.0

[mbutrovich]

Draft as we're only testing rc1 at the moment.

Which issue does this PR close?

Closes #.

Rationale for this change

What changes are included in this PR?

How are these changes tested?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.41%. Comparing base (f09f8af) to head (282a13f).
⚠️ Report is 782 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2935      +/-   ##
============================================
+ Coverage     56.12%   59.41%   +3.28%     
- Complexity      976     1368     +392     
============================================
  Files           119      167      +48     
  Lines         11743    15353    +3610     
  Branches       2251     2548     +297     
============================================
+ Hits           6591     9122    +2531     
- Misses         4012     4945     +933     
- Partials       1140     1286     +146     

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