Replace gopass lib with golang.org/x/term

[catthehacker]

fix: replace gopass lib with golang.org/x/term
Additionally replaced Fatalf with Errorf since it's bad to exit a program this way (like Panic)

Ongoing effort to remove old and abandoned libraries

[codecov]

Codecov Report

Merging #674 (3ce1e36) into master (0f04942) will increase coverage by 0.72%.
The diff coverage is 61.50%.

@@            Coverage Diff             @@
##           master     #674      +/-   ##
==========================================
+ Coverage   49.27%   50.00%   +0.72%     
==========================================
  Files          23       23              
  Lines        2401     2518     +117     
==========================================
+ Hits         1183     1259      +76     
- Misses       1090     1124      +34     
- Partials      128      135       +7     

Impacted Files	Coverage Δ
pkg/container/docker_run.go	1.82% <0.00%> (-0.11%)	⬇️
pkg/common/git.go	55.88% <5.00%> (-3.92%)	⬇️
pkg/model/workflow.go	30.71% <33.33%> (+5.00%)	⬆️
pkg/model/planner.go	34.56% <41.37%> (+1.48%)	⬆️
pkg/container/docker_pull.go	36.17% <64.70%> (+17.98%)	⬆️
pkg/runner/step_context.go	71.71% <72.64%> (+2.76%)	⬆️
pkg/runner/run_context.go	77.54% <94.54%> (+1.14%)	⬆️
pkg/runner/runner.go	76.92% <100.00%> (+0.45%)	⬆️

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