build(deps): Bump alpine from 3.21 to 3.22

Bumps alpine from 3.21 to 3.22.

---
updated-dependencies:
- dependency-name: alpine
  dependency-version: '3.22'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Dockerfile

@@ -8,7 +8,7 @@ WORKDIR /tflint
 COPY . /tflint
 RUN GOOS=$TARGETOS GOARCH=$TARGETARCH make build
 
-FROM alpine:3.21
+FROM alpine:3.22
 
 LABEL maintainer=terraform-linters