HADOOP-19794: create-release version parsing incompatible with Java 17

[cnauroth]

Description of PR

Remove the last step of the sed parsing logic that attempted to break apart the older X.Y versioning convention (e.g. 1.8) and choose just the Y component (e.g. 8). This is no longer relevant for the newer versioning convention, e.g. Java 17.

How was this patch tested?

I did a successful dry run of creating a 3.5.0 release after applying this patch.

Here is a transcript of how the chain of sed operations works on branch-3.4 vs. trunk. Notice that on trunk, the final step returns an empty result, which is why we need to remove it.

branch-3.4:
> grep "<javac.version>" "${BASEDIR}/hadoop-project/pom.xml" | head -1 | sed  -e 's|^ *<javac.version>||'
1.8</javac.version>

> grep "<javac.version>" "${BASEDIR}/hadoop-project/pom.xml" | head -1 | sed  -e 's|^ *<javac.version>||' -e 's|</javac.version>.*$||'
1.8

> grep "<javac.version>" "${BASEDIR}/hadoop-project/pom.xml" | head -1 | sed  -e 's|^ *<javac.version>||' -e 's|</javac.version>.*$||' -e 's|..||'
8

trunk:
> grep "<javac.version>" "${BASEDIR}/hadoop-project/pom.xml" | head -1 | sed  -e 's|^ *<javac.version>||'
17</javac.version>

> grep "<javac.version>" "${BASEDIR}/hadoop-project/pom.xml" | head -1 | sed  -e 's|^ *<javac.version>||' -e 's|</javac.version>.*$||'
17

> grep "<javac.version>" "${BASEDIR}/hadoop-project/pom.xml" | head -1 | sed  -e 's|^ *<javac.version>||' -e 's|</javac.version>.*$||' -e 's|..||'

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

AI Tooling

If an AI tool was used:

• The PR includes the phrase "Contains content generated by "
  where is the name of the AI tool used.
• My use of AI contributions follows the ASF legal policy
  https://www.apache.org/legal/generative-tooling.html

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	22m 8s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	shelldocs	0m 0s		Shelldocs was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+0 🆗	mvndep	8m 33s		Maven dependency ordering for branch
+1 💚	shadedclient	27m 31s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 28s		Maven dependency ordering for patch
+1 💚	blanks	0m 1s		The patch has no blanks issues.
+1 💚	shellcheck	0m 2s		No new issues.
+1 💚	shadedclient	26m 3s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 35s		The patch does not generate ASF License warnings.
		88m 9s

Subsystem	Report/Notes
Docker	ClientAPI=1.53 ServerAPI=1.53 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8210/1/artifact/out/Dockerfile
GITHUB PR	#8210
Optional Tests	dupname asflicense codespell detsecrets shellcheck shelldocs
uname	Linux d8bf62b7decd 5.15.0-164-generic #174-Ubuntu SMP Fri Nov 14 20:25:16 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 428f01e
Max. process+thread count	634 (vs. ulimit of 5500)
modules	C: U:
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8210/1/console
versions	git=2.25.1 maven=3.9.11 shellcheck=0.7.0
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