Fix DHSGS large step size bug

[shoubhikraj]

• Fix DHSGS large step sizes
• Only print TS guess if method converged

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Checklist

• [x] The changes include an associated explanation of how/why
• [x] Test pass
• [x] Documentation has been updated
• [x] Changelog has been updated

[codecov[bot]]

Codecov Report

Merging #297 (315f4c2) into v1.4.1 (86a8109) will increase coverage by 0.00%. Report is 1 commits behind head on v1.4.1. The diff coverage is 98.90%.

@@           Coverage Diff           @@
##           v1.4.1     #297   +/-   ##
=======================================
  Coverage   97.33%   97.33%           
=======================================
  Files         203      203           
  Lines       22445    22492   +47     
=======================================
+ Hits        21846    21893   +47     
  Misses        599      599           

Flag	Coverage Δ
unittests	97.33% <98.90%> (+<0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
autode/config.py	100.00% <ø> (ø)
autode/thermochemistry/igm.py	99.40% <98.64%> (+0.14%)	:arrow_up:
autode/bracket/base.py	96.00% <100.00%> (ø)
autode/bracket/dhs.py	98.40% <100.00%> (+<0.01%)	:arrow_up:
tests/test_bracket/test_dhs.py	100.00% <100.00%> (ø)
tests/test_thermochem.py	100.00% <100.00%> (ø)

[shoubhikraj]

@t-young31 Could you please rerun the failing CI runs again?

[t-young31]

@shoubhikraj happy to merge?

[shoubhikraj]

@t-young31 Yes sure!