build(deps): bump golang from 1.25.5 to 1.26rc2

Bumps golang from 1.25.5 to 1.26rc2.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.26rc2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -1,5 +1,5 @@
 # STEP 1: Build sqlc
-FROM golang:1.25.5 AS builder
+FROM golang:1.26rc2 AS builder
 
 COPY . /workspace
 WORKDIR /workspace