chore: bump Rust to 1.95

[krishvishal]

Bumps the toolchain channel in rust-toolchain.toml and the RUST_VERSION ARG default across all Dockerfiles from 1.94 to 1.95.

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.38%. Comparing base (5159412) to head (792fd7c).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
core/consensus/src/impls.rs	0.00%	1 Missing ⚠️
core/partitions/src/types.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3153      +/-   ##
============================================
- Coverage     73.16%   70.38%   -2.79%     
  Complexity      943      943              
============================================
  Files          1126     1126              
  Lines         99022    94344    -4678     
  Branches      75617    70957    -4660     
============================================
- Hits          72454    66404    -6050     
- Misses        23959    25139    +1180     
- Partials       2609     2801     +192     

Components	Coverage Δ
Rust Core	70.51% <71.42%> (-3.68%)	⬇️
Java SDK	62.30% <ø> (ø)
C# SDK	69.10% <ø> (-0.33%)	⬇️
Python SDK	81.43% <ø> (ø)
Node SDK	91.53% <ø> (+0.12%)	⬆️
Go SDK	40.83% <ø> (ø)

Files with missing lines	Coverage Δ
...ore/common/src/types/message/messages_batch_mut.rs	49.69% <100.00%> (-0.21%)	⬇️
core/server/src/http/mapper.rs	85.65% <100.00%> (+0.40%)	⬆️
core/server/src/shard/system/segments.rs	88.88% <100.00%> (-1.04%)	⬇️
core/server/src/streaming/partitions/storage.rs	67.19% <100.00%> (+0.52%)	⬆️
core/consensus/src/impls.rs	74.68% <0.00%> (-0.05%)	⬇️
core/partitions/src/types.rs	6.03% <0.00%> (ø)

... and 115 files with indirect coverage changes

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[krishvishal]

C# failure looks flaky.