Escape colon in job name

[Kesin11]

Mermaid gantt rely on ":" character, so mermaid syntax will broken if job name or step name has ":".
We should escape ":" by removing them.

[github-actions]

Code Metrics Report

	main (48cf6f9)	#22 (3350b9b)	+/-
Coverage	0.0%	0.0%	0.0%
Test Execution Time	18s	1s	-17s

Details

  |                     | main (48cf6f9) | #22 (3350b9b) | +/-  |
  |---------------------|----------------|---------------|------|
  | Coverage            |           0.0% |          0.0% | 0.0% |
  |   Files             |              0 |             0 |    0 |
  |   Lines             |              0 |             0 |    0 |
  |   Covered           |              0 |             0 |    0 |
+ | Test Execution Time |            18s |            1s | -17s |

dist_size

	main (48cf6f9)	#22 (3350b9b)	+/-
post.js	1306950byte	1307041byte	91byte
main.js	55byte	55byte	0byte

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Reported by octocov