build(deps): bump golang from 1.20.7-alpine3.18 to 1.21.5-alpine3.18

Bumps golang from 1.20.7-alpine3.18 to 1.21.5-alpine3.18.

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

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

Dockerfile

@@ -1,12 +1,12 @@
-FROM golang:1.20.7-alpine3.18@sha256:7efb78dac256c450d194e556e96f80936528335033a26d703ec8146cec8c2090 AS build
+FROM golang:1.21.5-alpine3.18@sha256:5c1cabd9a3c6851a3e18735a2c133fbd8f67fe37eb3203318b7af2ffd2547095 AS build
 WORKDIR /usr/src/app
 RUN apk --no-cache add git make
 COPY ./go.mod ./go.sum ./
 RUN go mod download
 COPY . .
 RUN make install
 
-FROM golang:1.20.7-alpine3.18@sha256:7efb78dac256c450d194e556e96f80936528335033a26d703ec8146cec8c2090
+FROM golang:1.21.5-alpine3.18@sha256:5c1cabd9a3c6851a3e18735a2c133fbd8f67fe37eb3203318b7af2ffd2547095
 # When running as non-root user, GOCACHE must be set to a directory
 # that is writable by that user. It will otherwise default to /.cache/go-build,
 # which is owned by root.

Dockerfile.examples

@@ -1,14 +1,14 @@
 # This Dockerfile is meant for generating example SBOMs in a way
 # that is reproducible for everyone.
-FROM golang:1.20.7-alpine3.18@sha256:7efb78dac256c450d194e556e96f80936528335033a26d703ec8146cec8c2090 AS build
+FROM golang:1.21.5-alpine3.18@sha256:5c1cabd9a3c6851a3e18735a2c133fbd8f67fe37eb3203318b7af2ffd2547095 AS build
 WORKDIR /usr/src/app
 RUN apk --no-cache add git make
 COPY ./go.mod ./go.sum ./
 RUN go mod download
 COPY . .
 RUN make install
 
-FROM golang:1.20.7-alpine3.18@sha256:7efb78dac256c450d194e556e96f80936528335033a26d703ec8146cec8c2090
+FROM golang:1.21.5-alpine3.18@sha256:5c1cabd9a3c6851a3e18735a2c133fbd8f67fe37eb3203318b7af2ffd2547095
 VOLUME /examples
 
 # Install prerequisites

Dockerfile.goreleaser

@@ -1,6 +1,6 @@
 # This Dockerfile is meant for GoReleaser exclusively, see .goreleaser.yml.
 # For manual builds, please use the regular Dockerfile or simply run "make docker".
-FROM golang:1.20.7-alpine3.18@sha256:7efb78dac256c450d194e556e96f80936528335033a26d703ec8146cec8c2090
+FROM golang:1.21.5-alpine3.18@sha256:5c1cabd9a3c6851a3e18735a2c133fbd8f67fe37eb3203318b7af2ffd2547095
 # When running as non-root user, GOCACHE must be set to a directory
 # that is writable by that user. It will otherwise default to /.cache/go-build,
 # which is owned by root.