gmail login suddenly failing

*I've been using fetchmail ( 6.3.24) for some time with my gmail
accounts. Recently the login has started failing. The credentials work
when logging in from a browser. Here is my sanitized fetchmailrc:*

set logfile "/var/log/maillog"
set postmaster "mailman"
set bouncemail
set no spambounce
set properties ""
defaults:
        timeout 240
poll pop.gmail.com
        proto POP3
        user "[email protected]"
        is mylocalmailbox
        password 'mypassword'
        preconnect "echo `date '+%b %d %H:%M:%S'` mylocalmailbox"
        ssl
        nokeep
        fetchall

*Here is the sanitized fetchmail log:*

fetchmail: 6.3.24 querying pop.gmail.com (protocol POP3) at Sat 24 Oct
2020 02:38:39 PM EDT: poll started
Oct 24 14:38:39 myusername
Trying to connect to 2607:f8b0:4002:c02::6d/995...connected.
fetchmail: Certificate chain, from root to peer, starting at depth 2:
fetchmail: Issuer Organization: GlobalSign
fetchmail: Issuer CommonName: GlobalSign
fetchmail: Subject CommonName: GlobalSign
fetchmail: Certificate at depth 1:
fetchmail: Issuer Organization: GlobalSign
fetchmail: Issuer CommonName: GlobalSign
fetchmail: Subject CommonName: GTS CA 1O1
fetchmail: Server certificate:
fetchmail: Issuer Organization: Google Trust Services
fetchmail: Issuer CommonName: GTS CA 1O1
fetchmail: Subject CommonName: pop.gmail.com
fetchmail: Subject Alternative Name: pop.gmail.com
fetchmail: pop.gmail.com key fingerprint:
47:D5:17:41:EC:FA:3D:C6:10:5B:F0:CB:10:D0:F2:CD
fetchmail: SSL/TLS: using protocol TLSv1.2, cipher
ECDHE-RSA-AES128-GCM-SHA256, 128/128 secret/processed bits
fetchmail: POP3< +OK Gpop ready for requests from
2600:1702:1a40:d5a0::48 h205mb28732228qke
fetchmail: POP3> CAPA
fetchmail: POP3< +OK Capability list follows
fetchmail: POP3< USER
fetchmail: POP3< RESP-CODES
fetchmail: POP3< EXPIRE 0
fetchmail: POP3< LOGIN-DELAY 300
fetchmail: POP3< TOP
fetchmail: POP3< UIDL
fetchmail: POP3< X-GOOGLE-RICO
fetchmail: POP3< SASL PLAIN XOAUTH2 OAUTHBEARER
fetchmail: POP3< .
fetchmail: POP3> USER [email protected]
fetchmail: POP3< +OK send PASS
fetchmail: POP3> PASS *
fetchmail: POP3< -ERR [AUTH] Username and password not accepted.
fetchmail: [AUTH] Username and password not accepted.
fetchmail: Authorization failure on [email protected]@pop.gmail.com
fetchmail: For help, see http://www.fetchmail.info/fetchmail-FAQ.html#R15
fetchmail: POP3> QUIT
fetchmail: POP3< +OK Bye h205mb28732228qke

*Has gmail changed the protocol for POP3? Can someone tell me what I
need to change to restore operation? TIA.*

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