Add ETSpy to known extensions list #1493

Job	Run time
rs_release-hs_release-ext_release	23m 41s
rs_release-hs_release-ext_dev	23m 56s
rs_release-hs_RnPatch-ext_release	22m 3s
rs_release-hs_RnPatch-ext_dev	22m 29s
rs_release-hs_RnMinor-ext_release	22m 11s
rs_release-hs_RnMinor-ext_dev	23m 52s
rs_dev-hs_RnMinor-ext_dev-dependencies_dev	22m 9s
rs_dev-hs_RnMinor-ext_dev-dependencies_pre_release	23m 16s
rs_dev-hs_RnMinor-ext_dev-dependencies_numba_dev	22m 40s
	3h 26m 17s

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