Update steel diffusion constraints

[GamzeUnlu95]

Update steel diffusion constraints as follows:

• removed growth_activity_lo and initial_activity_lo for bof_steel from 2030 onwards
• changed the growth_activity_up for dri_gas_steel, dri_h2_steel, and eaf_steel to 0.075 from 2030 onwards
• changed the initial_activity_up for dri_gas_steel and dri_h2_steel to 1.0 from 2030 onwards

How to review

No review is needed, just changing the parameters in Excel data file as agreed before.

PR checklist

• Continuous integration checks all ✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.5%. Comparing base (6032244) to head (e4e8eaf).
Report is 255 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #247     +/-   ##
=======================================
- Coverage   76.5%   75.5%   -1.0%     
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  Files        203     203             
  Lines      15546   15546             
=======================================
- Hits       11896   11748    -148     
- Misses      3650    3798    +148     

see 7 files with indirect coverage changes

[glatterf42]

Thanks, this looks good to me :)
Please use either the rebase or squash strategy when merging this PR.