fix(ci): skip Codecov upload for Dependabot PRs

[JerrettDavis]

Summary

• Dependabot PRs run with restricted secrets and cannot access CODECOV_TOKEN
• The codecov/codecov-action step fails with HTTP 400 "Token required because branch is protected"
• Build and tests pass successfully; only the coverage upload step fails
• This fix adds if: github.actor != 'dependabot[bot]' to skip the Codecov step for Dependabot PRs

Test plan

• CI passes on this PR
• After merging, rebase Dependabot PRs (chore(deps): Bump actions/checkout from 6 to 7 in the github-actions-dependencies group across 1 directory #4, chore(deps): Bump TinyBDD.Xunit from 0.19.23 to 0.19.26 #5) to pick up the fix — they should pass CI

🤖 Generated with Claude Code

[github-actions]

Code Coverage

Summary
  Generated on: 06/22/2026 - 18:11:19
  Coverage date: 06/22/2026 - 18:10:49 - 06/22/2026 - 18:11:16
  Parser: MultiReport (7x Cobertura)
  Assemblies: 3
  Classes: 7
  Files: 6
  Line coverage: 39.6%
  Covered lines: 86
  Uncovered lines: 131
  Coverable lines: 217
  Total lines: 515
  Branch coverage: 25.6% (21 of 82)
  Covered branches: 21
  Total branches: 82
  Method coverage: 62.1% (23 of 37)
  Full method coverage: 54% (20 of 37)
  Covered methods: 23
  Fully covered methods: 20
  Total methods: 37

Slncs                      89.2%
  Slncs.Solution            100%
  Slncs.SolutionBuilder      89%

Slncs.Sdk                  30.5%
  Slncs.Sdk.SlncsExec         0%
  Slncs.Sdk.SlncsRunner      90%
  Slncs.Sdk.SlnxParse         0%

SlncsGen                      0%
  Program                     0%
  SlncsGen.ScriptGlobals      0%