deps: bump go.mod to go1.18

[catthehacker]

Required for generics support

[mergify]

@catthehacker this pull request has failed checks 🛠

[ChristopherHX]

The readme should reflect this change. No longer 1.16+, instead 1.18+.

[github-actions]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ CREDENTIALS	secretlint	yes		no	0.97s
✅ EDITORCONFIG	editorconfig-checker	3		0	0.56s
✅ GIT	git_diff	yes		no	0.0s
✅ MARKDOWN	markdownlint	1		0	0.32s

See errors details in artifact MegaLinter reports on CI Job page
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

[codecov]

Codecov Report

Merging #1088 (80ca47c) into master (4f8da0a) will increase coverage by 2.48%.
The diff coverage is 83.77%.

@@            Coverage Diff             @@
##           master    #1088      +/-   ##
==========================================
+ Coverage   57.50%   59.99%   +2.48%     
==========================================
  Files          32       38       +6     
  Lines        4594     4839     +245     
==========================================
+ Hits         2642     2903     +261     
+ Misses       1729     1704      -25     
- Partials      223      232       +9     

Impacted Files	Coverage Δ
pkg/model/action.go	0.00% <ø> (ø)
pkg/model/planner.go	50.73% <ø> (+0.32%)	⬆️
pkg/container/docker_run.go	4.88% <5.00%> (-0.66%)	⬇️
pkg/runner/logger.go	66.00% <67.56%> (+0.56%)	⬆️
pkg/runner/runner.go	72.80% <71.69%> (-3.67%)	⬇️
pkg/exprparser/interpreter.go	74.57% <75.00%> (+1.17%)	⬆️
pkg/runner/expression.go	91.02% <78.26%> (+0.20%)	⬆️
pkg/runner/step.go	80.76% <80.76%> (ø)
pkg/runner/run_context.go	78.84% <82.50%> (-0.81%)	⬇️
pkg/runner/action.go	83.46% <83.46%> (ø)
... and 16 more

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