Made release notes script portable.

[kgodey]

Fixes #3515

Developer Certificate of Origin

Developer Certificate of Origin

Developer Certificate of Origin
Version 1.1

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Developer's Certificate of Origin 1.1

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(a) The contribution was created in whole or in part by me and I
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(b) The contribution is based upon previous work that, to the best
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[kgodey]

This was working for me after these changes. Assigned to @Anish9901 to make sure it runs on a Mac and to @seancolsen to make sure it still runs on Linux and does what it supposed to.

[seancolsen]

I pushed some changes to further improve this so that it would work for me.

@Anish9901 perhaps you could test on both Mac OS and Linux?

[Anish9901]

Looks good to me @seancolsen & @kgodey. I ran the script on Mac OS and Linux and upon diffing the outputs, I found no changes between them. On Mac OS, I did get a warning, but, I am fine with ignoring it.

Here is the exact warning that I was getting if you're curious:

<string>:3: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).