Update golang toolchain to 1.23.8 #4856

Job	Run time
Component Tests	1m 10s
Build unsigned snapshot	4m 9s
Lint	31s
Unit Tests	3m 49s
Build Grafana Dashboard Example	1m 42s
Build signed snapshot	6m 49s
Performance Tests	7m 13s
Integration Tests - Official OSS Images (bookworm, stable, debian)	3m 24s
Integration Tests (rockylinux, 8)	5m 15s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	3m 33s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	3m 18s
Integration Tests (rockylinux, 9)	4m 44s
Integration Tests - Official OSS Images (alpine, stable, alpine)	3m 11s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	3m 30s
Integration Tests (almalinux, 8)	5m 0s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	3m 12s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	3m 26s
Integration Tests (almalinux, 9)	5m 7s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	3m 31s
Integration Tests (amazonlinux, 2)	5m 53s
Integration Tests (amazonlinux, 2023)	5m 13s
Integration Tests (oraclelinux, 8)	6m 31s
Integration Tests (oraclelinux, 9)	5m 41s
Integration Tests (ubuntu, 24.04)	3m 35s
Integration Tests (alpine, 3.18)	3m 7s
Integration Tests (alpine, 3.19)	3m 2s
Integration Tests (alpine, 3.20)	3m 2s
Integration Tests (alpine, 3.21)	3m 4s
Integration Tests (debian, bullseye-slim)	3m 39s
Integration Tests (debian, bookworm-slim)	3m 36s
trigger-release-workflow	0s
	1h 58m 57s

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