Update .ignore to exclude log files.

[Chenjp]

Ignore dubbo/dubbo-rpc/dubbo-rpc-api/custom-access.log and its rotated files.

What is the purpose of the change

dubbo/dubbo-rpc/dubbo-rpc-api: Log files - custom-access.log and custom-access.log{YYYYMMDD} changed after TESTS. Make them non-versioned.

Brief changelog

dubbo/dubbo-rpc/dubbo-rpc-api: make custom-access.log and custom-access.log{YYYYMMDD} non-versioned.

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[Chenjp]

@AlbumenJ would you please merge this PR to (apache:3.3)?

[AlbumenJ]

@AlbumenJ would you please merge this PR to (apache:3.3)?

done