Fix deprecated usage of GitHub action 'set-output'

[SSoelvsten]

Closes #658 .

[github-actions]

🟡 Regression Test (QBF 'ep_dual/8x8_6_e-8-1_p-2-3_bwnib')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of -0.03% (stdev: 3.14%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	5115.70	5117.00
Standard Deviation	160.44	145.84

Number of samples: 10

[github-actions]

🟡 Regression Test (QBF 'breakthrough_dual/3x6_10_bwnib')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of -0.14% (stdev: 0.96%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	5167.40	5174.50
Standard Deviation	35.35	49.46

Number of samples: 10

[github-actions]

🟢 Regression Test (QBF 'httt/4x4_9_tippy_bwnib')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of 0.02% (stdev: 0.28%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	9327.70	9325.50
Standard Deviation	22.13	26.46

Number of samples: 10

[github-actions]

🟡 Regression Test (Picotrav 'adder')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of -4.47% (stdev: 11.90%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	9942.20	10386.50
Standard Deviation	307.45	1236.29

Number of samples: 10

[github-actions]

🟢 Regression Test (12-Queens)

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of 0.29% (stdev: 0.53%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	11455.40	11421.70
Standard Deviation	60.54	40.95

Number of samples: 10

[github-actions]

🟢 Regression Test (QBF 'connect4/6x6_11_connect4_bwnib')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of 0.17% (stdev: 0.72%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	12095.90	12074.80
Standard Deviation	54.93	87.45

Number of samples: 10

[github-actions]

🟡 Regression Test (QBF 'domineering/5x5_13_bwnib')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of -0.03% (stdev: 1.04%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	15552.50	15556.80
Standard Deviation	116.25	161.37

Number of samples: 10

[github-actions]

🟡 Regression Test (QBF 'hex/hein_08_5x5-11_bwnib')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of -0.11% (stdev: 0.58%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	16898.60	16917.30
Standard Deviation	83.21	97.38

Number of samples: 10

[github-actions]

🟡 Regression Test (QBF 'breakthrough/3x4_19_bwnib')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of -0.19% (stdev: 0.54%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	22345.70	22389.20
Standard Deviation	120.10	104.72

Number of samples: 10

[github-actions]

🟢 Regression Test (QBF 'ep/8x8_7_e-8-1_p-3-4_bwnib')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of 0.18% (stdev: 0.55%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	29670.50	29616.70
Standard Deviation	161.93	120.58

Number of samples: 10

[github-actions]

🟢 Regression Test (Picotrav 'mem_ctrl')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of 0.06% (stdev: 0.51%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	115258.60	115187.20
Standard Deviation	296.63	592.73

Number of samples: 5

[github-actions]

🟡 Regression Test (Picotrav 'arbiter')

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of -14.88% (stdev: 20.95%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	64386.90	73969.30
Standard Deviation	449.95	15495.71

Number of samples: 10

[github-actions]

🟢 Regression Test (14-Queens)

'ssoelvsten/adiar/gh-action/set-output' is a change in performance of 0.99% (stdev: 2.16%).

...	origin/main	ssoelvsten/adiar/gh-action/set-output
Mean	270395.00	267706.00
Standard Deviation	5843.47	341.43

Number of samples: 3