Bump golang from 1.25-alpine3.22 to 1.26-alpine3.22

Bumps golang from 1.25-alpine3.22 to 1.26-alpine3.22.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.26-alpine3.22
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.25-alpine3.23 AS builder
+FROM golang:1.26-alpine3.23 AS builder
 
 RUN apk add --no-cache bash git gcc musl-dev
 
@@ -18,7 +18,7 @@ FROM scratch AS binary
 COPY --from=builder /src/bin/helm-controller /bin/
 
 # Dev stage for package, testing, and validation
-FROM golang:1.25-alpine3.23 AS dev
+FROM golang:1.26-alpine3.23 AS dev
 ARG ARCH
 ENV ARCH=$ARCH
 RUN apk add --no-cache bash git curl