Bump go4.org/intern to fix build on go1.21

[jonjohnsonjr]

Trying to build on go1.21 fails with a scary error about the GC moving heap objects. This is due to a conservative assumption around future go releases in go4.org/unsafe/assume-no-moving-gc

A more recent version actually checks with the go runtime, see:

https://go-review.googlesource.com/c/go/+/498121

• I added CHANGELOG entry for this change.
• Change is not relevant to the end user.

Changes

Bumped go4.org/intern to go4org/intern@6c62f75

Verification

At HEAD:

$ git rev-parse HEAD
bf5c275097a5917498a036db8603315fd5849c31

$ gotip run ./cmd/thanos help
go: downloading go4.org/intern v0.0.0-20220617035311-6925f38cc365
go: downloading go4.org/unsafe/assume-no-moving-gc v0.0.0-20230209150437-ee73d164e760
panic: Something in this program imports go4.org/unsafe/assume-no-moving-gc to declare that it assumes a non-moving garbage collector, but your version of go4.org/unsafe/assume-no-moving-gc hasn't been updated to assert that it's safe against the devel go1.22-ac64a362 Sat Aug 12 03:56:58 2023 +0000 runtime. If you want to risk it, run with environment variable ASSUME_NO_MOVING_GC_UNSAFE_RISK_IT_WITH="devel go1.22-ac64a362 Sat Aug 12 03:56:58 2023 +0000" set. Notably, if devel go1.22-ac64a362 Sat Aug 12 03:56:58 2023 +0000 adds a moving garbage collector, this program is unsafe to use.

goroutine 1 [running]:
go4.org/unsafe/assume-no-moving-gc.init.0()
	/Users/jonjohnson/go/pkg/mod/go4.org/unsafe/assume-no-moving-gc@v0.0.0-20230209150437-ee73d164e760/untested.go:25 +0x1a0
exit status 2

With my change:

$ git rev-parse HEAD
33bd69f8fe6e0bf582d551f7cecd25a071f22217

$ gotip run ./cmd/thanos help 2>&1 | head
usage: thanos [<flags>] <command> [<args> ...]

A block storage based long-term storage for Prometheus.

Flags:
  -h, --help               Show context-sensitive help (also try --help-long and
                           --help-man).
      --log.format=logfmt  Log format to use. Possible options: logfmt or json.
      --log.level=info     Log filtering level.
      --tracing.config=<content>

[saswatamcode]

Thanks!