Unrestrict parity-scale-codec crate version

[Robbepop]

Just use any version 2. Micro PR.

[codecov-commenter]

Codecov Report

Merging #930 (3998236) into master (725c2f7) will decrease coverage by 1.27%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #930      +/-   ##
==========================================
- Coverage   86.17%   84.89%   -1.28%     
==========================================
  Files         171      158      -13     
  Lines        7653     6450    -1203     
==========================================
- Hits         6595     5476    -1119     
+ Misses       1058      974      -84     

Impacted Files	Coverage Δ
crates/lang/ir/src/ir/item_impl/mod.rs	73.58% <0.00%> (-17.80%)	⬇️
crates/lang/codegen/src/generator/metadata.rs	90.90% <0.00%> (-6.66%)	⬇️
crates/lang/ir/src/ir/item_impl/impl_item.rs	51.35% <0.00%> (-6.10%)	⬇️
...ates/storage/src/collections/hashmap/fuzz_tests.rs	95.74% <0.00%> (-4.26%)	⬇️
crates/lang/ir/src/ir/idents_lint.rs	68.42% <0.00%> (-3.01%)	⬇️
crates/lang/ir/src/ir/config.rs	88.88% <0.00%> (-2.61%)	⬇️
crates/lang/ir/src/ir/trait_def.rs	92.89% <0.00%> (-0.21%)	⬇️
crates/lang/codegen/src/generator/item_impls.rs
crates/lang/codegen/src/generator/cross_calling.rs
...ates/lang/codegen/src/generator/chain_extension.rs
... and 20 more

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