Decrease minimum serde version to 1.0.152

[banool]

As far as I can tell, the minimum version of 1.0.157 is unnecessary. The way I've determined that is just from running the build + tests:

cargo build --workspace
cargo test --workspace

This addresses #651. For my needs at least 1.0.152 is actually sufficient (rather than 1.0.149), though we could try go lower.

[codecov]

Codecov Report

Merging #653 (81507a2) into master (04bf8f3) will not change coverage.
Report is 2 commits behind head on master.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #653   +/-   ##
=======================================
  Coverage   64.85%   64.85%           
=======================================
  Files          36       36           
  Lines        2177     2177           
=======================================
  Hits         1412     1412           
  Misses        765      765           

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[jonasbb]

Loosening the version constraint looks fine, as long as the test still pass. Thanks for the PR.
bors r+

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