remove unbound type parameters

[nsajko]

Unbound type parameters often cause performance issues and run time dispatch.

Issue found using JuliaLang/julia#46608

[coveralls]

Pull Request Test Coverage Report for Build 3018041945

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 8 unchanged lines in 5 files lost coverage.
• Overall coverage increased (+1.2%) to 88.879%

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Files with Coverage Reduction	New Missed Lines	%
src/aggregators/prioritytable.jl	1	86.86%
src/extended_jump_array.jl	1	31.88%
src/jumps.jl	1	87.28%
src/coupling.jl	2	78.18%
src/spatial/spatial_massaction_jump.jl	3	85.45%

Totals
Change from base Build 3009189274:	1.2%
Covered Lines:	1942
Relevant Lines:	2185

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💛 - Coveralls