Use ubuntu-22.04

[nanasess]

GitHub Actions の Ubuntu-18.04 が非推奨になるため、 Ubuntu-22.04 へ更新する

[codecov-commenter]

Codecov Report

Merging #578 (762e006) into master (c8b4836) will increase coverage by 0.67%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #578      +/-   ##
==========================================
+ Coverage   54.62%   55.29%   +0.67%     
==========================================
  Files          76       75       -1     
  Lines        9060     8863     -197     
==========================================
- Hits         4949     4901      -48     
+ Misses       4111     3962     -149     

Flag	Coverage Δ
tests	55.29% <ø> (+0.67%)	⬆️

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

Impacted Files	Coverage Δ
data/class/helper/SC_Helper_Category.php	16.94% <0.00%> (-1.39%)	⬇️
data/class/SC_Customer.php	83.00% <0.00%> (-0.81%)	⬇️
data/class/helper/SC_Helper_TaxRule.php	69.85% <0.00%> (-0.66%)	⬇️
data/class/SC_SendMail.php	86.36% <0.00%> (-0.50%)	⬇️
data/class/helper/SC_Helper_Customer.php	15.72% <0.00%> (-0.27%)	⬇️
data/class/helper/SC_Helper_Purchase.php	73.54% <0.00%> (-0.14%)	⬇️
data/class/SC_CartSession.php	95.93% <0.00%> (-0.02%)	⬇️
data/class/SC_CheckError.php	99.74% <0.00%> (-0.01%)	⬇️
data/class/SC_Date.php	100.00% <0.00%> (ø)
data/class/SC_Initial.php	0.00% <0.00%> (ø)
... and 21 more

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[chihiro-adachi]

@nanasess
ありがとうございます。マージしました。