Bump the docker-deps group across 6 directories with 5 updates

[dependabot]

Bumps the docker-deps group with 1 update in the /examples/deployment/docker/db_server directory: mysql.
Bumps the docker-deps group with 1 update in the /examples/deployment/docker/db_server/postgresql directory: postgres.
Bumps the docker-deps group with 2 updates in the /examples/deployment/docker/log_server directory: golang and distroless/base-debian12.
Bumps the docker-deps group with 2 updates in the /examples/deployment/docker/log_signer directory: golang and distroless/base-debian12.
Bumps the docker-deps group with 1 update in the /examples/deployment/kubernetes/mysql/image directory: ubuntu.
Bumps the docker-deps group with 1 update in the /integration/cloudbuild/testbase directory: golang.

Updates mysql from c4678fe to a2d1269

Updates postgres from 18.1 to 18.3

Updates golang from 1.25.6-bookworm to 1.26.0-bookworm

Updates distroless/base-debian12 from 347a41e to 937c7ea

Updates golang from 1.25.6-bookworm to 1.26.0-bookworm

Updates distroless/base-debian12 from 347a41e to 937c7ea

Updates ubuntu from c7eb020 to 3ba65aa

Updates golang from 1.25.6-bookworm to 1.26.0-bookworm

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[dpebot]

/gcbrun