Makefile: Update OPM version to 1.20.0

[mrogers950]

The SDK-aligned version of OPM was too old for the file-based catalog commands. This sets the OPM version to download locally to 1.20.0.

[jhrozek]

oh crap, this is my fault:

jhrozek@flatline ~/devel/file-integrity-operator (fio_selinux_profile●)$ which opm
/home/jhrozek/bin/opm
jhrozek@flatline ~/devel/file-integrity-operator (fio_selinux_profile●)$ opm version
Version: version.Version{OpmVersion:"60941887e", GitCommit:"60941887ec69e459e82398f5a523eac84b5b3996", BuildDate:"2022-09-21T21:25:16Z", GoOs:"linux", GoArch:"amd64"}

I /did/ test the catalogs but using an OPM version in ~/bin/.

Sorry and thanks for catching this.

[jhrozek]

the e2e failure seems transient:

 Error from server (Forbidden): pods "must-gather-" is forbidden: error looking up service account openshift-must-gather-jt4f7/default: serviceaccount "default" not found 

[jhrozek]

/retest

[jhrozek]

/lgtm

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