Fix sequence skipping when a collator misses its slot

[Garandor]

Description

• Block production now skips all evenodd relaychain block numbers
• Also changes nimbus to pull from tag instead of branch
• Also changes the non-eligible log print to
  🔮 Skipping candidate production because we are not eligible for slot 1234
  to clarify non-eligibility only for the current slot

Nimbus diff: Manta-Network/nimbus@manta-v3.4.1...Manta-Network:nimbus:v3.4.3

closes #845
closes #799
prep for #825

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Situational Notes:

• If adding functionality, write unit tests!
• If importing a new pallet, choose a proper module index for it, and allow it in BaseFilter. Ensure every extrinsic works from front-end. If there's corresponding tool, ensure both work for each other.
• If needed, update our Javascript/Typescript APIs. These APIs are officially used by exchanges or community developers.
• If modifying existing runtime storage items, make sure to implement storage migrations for the runtime and test them with try-runtime. This includes migrations inherited from upstream changes, and you can search the diffs for modifications of #[pallet::storage] items to check for any.
• If runtime changes, need to update the version numbers properly:
  • authoring_version: The version of the authorship interface. An authoring node will not attempt to author blocks unless this is equal to its native runtime.
  • spec_version: The version of the runtime specification. A full node will not attempt to use its native runtime in substitute for the on-chain Wasm runtime unless all of spec_name, spec_version, and authoring_version are the same between Wasm and native.
  • impl_version: The version of the implementation of the specification. Nodes are free to ignore this; it serves only as an indication that the code is different; as long as the other two versions are the same then while the actual code may be different, it is nonetheless required to do the same thing. Non-consensus-breaking optimizations are about the only changes that could be made which would result in only the impl_version changing.
  • transaction_version: The version of the extrinsics interface. This number must be updated in the following circumstances: extrinsic parameters (number, order, or types) have been changed; extrinsics or pallets have been removed; or the pallet order in the construct_runtime! macro or extrinsic order in a pallet has been changed. You can run the metadata_diff.yml workflow for help. If this number is updated, then the spec_version must also be updated
• Verify benchmarks & weights have been updated for any modified runtime logics

[ghzlatarev]

pallet_author_inherent benchmark is failing with `panicked at Block invalid, supplied author is not eligible. ',/home/georgi/.cargo/git/checkouts/nimbus-43d01ec6e06cfb96/1b1e46f/pallets/author-inherent/src/lib.rs:133
because we're producing on an odd block not even so the first one is not eligible.
We could just change that if, I don't think it matters overall whether we do odd or even.

[ferrell-code]

lgtm