Update example repos to 2.18.0

[huonw]

Now that 2.18.0 is released, we should update all the example- repos to use it: https://github.com/pantsbuild?q=example&type=all&language=&sort=name

• https://github.com/pantsbuild/example-adhoc Upgrade to Pants 2.18.0 example-adhoc#5
• https://github.com/pantsbuild/example-codegen pants: upgrade Pants to 2.18.0 example-codegen#24
• https://github.com/pantsbuild/example-django Upgrade to 2.18.0 example-django#36
• https://github.com/pantsbuild/example-docker pants: upgrade Pants to 2.18.0 example-docker#13
• https://github.com/pantsbuild/example-golang Upgrade to Pants 2.18.0 example-golang#14
• https://github.com/pantsbuild/example-javascript pants: upgrade Pants to 2.18.0 example-javascript#3
• https://github.com/pantsbuild/example-jvm Upgrade to pants 2.18.0 and M1-compatible jdk example-jvm#29
• https://github.com/pantsbuild/example-kotlin pants: upgrade Pants to 2.18.0 example-kotlin#14 / pants: upgrade Pants to 2.18.1 example-kotlin#15
• https://github.com/pantsbuild/example-python Upgrade to Pants 2.18.0 example-python#130
• https://github.com/pantsbuild/example-visibility pants: upgrade Pants to 2.18.0 example-visibility#4

(NB. not https://github.com/pantsbuild/example-plugin)

[AlexTereshenkov]

example-kotlin will be upgraded once we have 2.18.1

[AlexTereshenkov]

All done