prometheus fails to build on armhf due to test panic: mmap, size 134217728: cannot allocate memory

prometheus 2.33.5+ds1-2 fails to build on armhf:

=== RUN TestRulesUnitTest/Long_evaluation_interval
Unit Testing: ./testdata/long-period.yml
panic: mmap, size 134217728: cannot allocate memory

goroutine 5344 [running]:
github.com/prometheus/prometheus/tsdb.handleChunkWriteError({0x18b4030, 0x4dac0b0})
 /<<PKGBUILDDIR>>/.build/src/github.com/prometheus/prometheus/tsdb/head_append.go:585 +0x88
github.com/prometheus/prometheus/tsdb/chunks.(*chunkWriteQueue).processJob(0x4e93320, {0x1, 0x1, 0x3d1aa49a000, 0x3d1aa49a000, {0x18baa9c, 0x4d42630}, 0x1900000008, 0x164feb4})
 /<<PKGBUILDDIR>>/.build/src/github.com/prometheus/prometheus/tsdb/chunks/chunk_write_queue.go:106 +0xb4
github.com/prometheus/prometheus/tsdb/chunks.(*chunkWriteQueue).start.func1()
 /<<PKGBUILDDIR>>/.build/src/github.com/prometheus/prometheus/tsdb/chunks/chunk_write_queue.go:94 +0xa8
created by github.com/prometheus/prometheus/tsdb/chunks.(*chunkWriteQueue).start
 /<<PKGBUILDDIR>>/.build/src/github.com/prometheus/prometheus/tsdb/chunks/chunk_write_queue.go:90 +0x74
FAIL github.com/prometheus/prometheus/cmd/promtool 13.307s

Full log: https://launchpadlibrarian.net/606855675/buildlog_ubuntu-kinetic-armhf.prometheus_2.33.5+ds1-2_BUILDING.txt.gz