build(deps): bump the docker group with 2 updates (#1040)

Bumps the docker group with 2 updates: golang and alpine.


Updates `golang` from 1.21.3-alpine to 1.21.4-alpine

Updates `alpine` from 3.18.4 to 3.18.5

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: docker
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: docker
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Diff for: Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=$BUILDPLATFORM golang:1.21.3-alpine AS builder
+FROM --platform=$BUILDPLATFORM golang:1.21.4-alpine AS builder
 WORKDIR /go/src/github.com/tus/tusd
 
 # Add gcc and libc-dev early so it is cached
@@ -29,7 +29,7 @@ RUN set -xe \
         -o /go/bin/tusd ./cmd/tusd/main.go
 
 # start a new stage that copies in the binary built in the previous stage
-FROM alpine:3.18.4
+FROM alpine:3.18.5
 WORKDIR /srv/tusd-data
 
 COPY ./docker/entrypoint.sh /usr/local/share/docker-entrypoint.sh