chore: upgrade to polkadot-v0.9.16

[Roznovjak]

Fixes: #368

[github-actions]

Crate versions that have been updated:

• hydradx: v7.0.1 -> v7.0.2
• primitives: v5.0.1 -> v5.0.2
• common-runtime: v100.0.1 -> v100.0.2
• hydradx-runtime: v102.0.0 -> v103.0.0
• testing-hydradx-runtime: v102.0.0 -> v103.0.0

Runtime versions don't match.

Runtime version has been increased.

[codecov]

Codecov Report

Merging #372 (2b8ccd6) into hydra-parachain (a7097f0) will not change coverage.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           hydra-parachain    #372   +/-   ##
===============================================
  Coverage                 0   0.00%           
===============================================
  Files                    0       1    +1     
  Lines                    0       2    +2     
===============================================
- Misses                   0       2    +2     

Impacted Files	Coverage Δ
primitives/src/constants.rs	0.00% <0.00%> (ø)

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