Fix runtime return type of enum.from() API

[goccy]

SSIA

[github-actions]

Code Metrics Report

	main (1bd89c5)	#271 (6f1e001)	+/-
Coverage	65.3%	65.3%	0.0%
Code to Test Ratio	1:0.3	1:0.3	0.0
Test Execution Time	7m39s	7m26s	-13s

Details

  |                     | main (1bd89c5) | #271 (6f1e001) | +/-  |
  |---------------------|----------------|----------------|------|
  | Coverage            |          65.3% |          65.3% | 0.0% |
  |   Files             |             77 |             77 |    0 |
  |   Lines             |          13765 |          13765 |    0 |
  |   Covered           |           8991 |           8991 |    0 |
  | Code to Test Ratio  |          1:0.3 |          1:0.3 |  0.0 |
  |   Code              |          42221 |          42221 |    0 |
  |   Test              |          15819 |          15819 |    0 |
+ | Test Execution Time |          7m39s |          7m26s | -13s |

Code coverage of files in pull request scope (0.0% → 0.0%)

Files	Coverage	+/-
grpc/federation/cel.go	0.0%	0.0%

---

Reported by octocov