build: adopt Go 1.26 as bootstrap toolchain for Go 1.28

[dmitshur]

This is the tracking issue for the Go 1.28 iteration of proposal #54265.

When it comes time to select what exact minor version of Go 1.26 to use as the minimum, we should take into account the information available from the last time we did this in #69315. Picking Go 1.26.0 or too "old" of a minor version may require the bootstrap process to work around issues that are fixed in later Go 1.26 minor releases. Picking too "high" of a minor version may involve overhead for developers, at least in the short-term after the bump. So we should take that into account and pick a version that strikes a good balance.

CC @golang/release.

[gabyhelp]

Related Issues

• build: adopt Go 1.24 as bootstrap toolchain for Go 1.26 #69315 (closed)
• build: adopt Go 1.22 as bootstrap toolchain for Go 1.24 #64751 (closed)
• cmd/dist: let go in PATH select a newer toolchain to satisfy minimum bootstrap version requirement #75143
• build: adopt Go 1.20 as bootstrap toolchain for Go 1.22 #54265 (closed)
• build: adopt Go 1.17 as bootstrap toolchain for Go 1.20 #44505 (closed)
• all: reopen tree for Go 1.26 development #73829 (closed)

Related Code Changes

• cmd/dist: enforce minimum bootstrap via own module's go directive
• src/make.{bash,bat,rc}: let go in PATH select a newer toolchain

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