Bump golang from 1.15 to 1.26

Bumps golang from 1.15 to 1.26.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: '1.26'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.15 as builder
+FROM golang:1.26 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests