Bump docker builds to Go v1.24.5

[joshuabaird]

When we bumped the toolchain to Go 1.24.5, we did not update the Fluentbit/Fluentd Dockerfiles to use 1.24.5 and their builds are now failing:

#16 [buildergo 7/7] RUN CGO_ENABLED=0 go build -ldflags '-w -s' -o /fluent-bit/fluent-bit /code/cmd/fluent-watcher/fluentbit/main.go
#16 0.052 go: go.mod requires go >= 1.24.5 (running go 1.24.1; GOTOOLCHAIN=local)