Fix Set-Cookie handling

[k1LoW]

SSIA.

[github-actions]

Code Metrics Report

	main (8793c05)	#48 (26a8bff)	+/-
Coverage	80.7%	80.7%	0.0%
Code to Test Ratio	1:2.1	1:2.2	+0.1
Test Execution Time	33s	39s	+6s

Details

  |                     | main (8793c05) | #48 (26a8bff) | +/-  |
  |---------------------|----------------|---------------|------|
  | Coverage            |          80.7% |         80.7% | 0.0% |
  |   Files             |              4 |             4 |    0 |
  |   Lines             |            300 |           300 |    0 |
  |   Covered           |            242 |           242 |    0 |
+ | Code to Test Ratio  |          1:2.1 |         1:2.2 | +0.1 |
  |   Code              |            660 |           660 |    0 |
+ |   Test              |           1391 |          1437 |  +46 |
- | Test Execution Time |            33s |           39s |  +6s |

Code coverage of files in pull request scope (86.7% → 86.7%)

Files	Coverage	+/-
rfc9111/shared.go	86.7%	0.0%

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Reported by octocov