chore: upgrade openresty version to 1.25.3.2

[shreemaan-abhishek]

Description

Version 1.25.3.1 contains a CVE. https://openresty.org/en/ann-1025003002.html

The openresty version upgrade is done by upgrading APISIX runtime to 1.2.1, the new APISIX runtime version uses openresty v1.25.3.2.

Proof that the version upgrade works:

• https://github.com/apache/apisix/actions/runs/10145860956/job/28052594019?pr=11419#step:19:25
• https://github.com/apache/apisix/actions/runs/10145860985/job/28052594977?pr=11419#step:7:23
• https://github.com/apache/apisix/actions/runs/10145860961/job/28052593247?pr=11419#step:21:25

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[membphis]

one PR for one thing

I think you'd better split this PR to two separate PRs.

the 1: upgrade openresty version
the 2: remove grpc related code

[membphis]

LGTM